The cost routine for Arm and Thumb2 was not recognising the idioms that
describe the addition with carry, this results in the instructions
appearing more expensive than they really are, which occasionally can lead
to poor choices by combine.  Recognising all the possible variants is
a little trickier than normal because the expressions can become complex
enough that this is no single canonical from.

	* config/arm/arm.c (strip_carry_operation): New function.
	(arm_rtx_costs_internal, case PLUS): Handle addtion with carry-in
	for SImode.

From-SVN: r277172

An earlier patch introduced arm_borrow_operation, this one introduces
the carry variant, which is the same except that the logic of the
carry-setting is inverted.  Having done this we can now match more
cases where the carry flag is propagated from comparisons with
different modes without having to define even more patterns.  A few
small changes to the expand patterns are required to directly create
the carry representation.

The iterators LTUGEU is no-longer needed and removed, as is the code
attribute 'cnb'.

Finally, we fix a long-standing bug which was probably inert before:
in Thumb2 a shift with ADC can only be by an immediate amount;
register-specified shifts are not permitted.

	* config/arm/predicates.md (arm_carry_operation): New special
	predicate.
	* config/arm/iterators.md (LTUGEU): Delete iterator.
	(cnb): Delete code attribute.
	(optab): Delete ltu and geu elements.
	* config/arm/arm.md (addsi3_carryin): Renamed from
	addsi3_carryin_<optab>.  Remove iterator and use arm_carry_operand.
	(add0si3_carryin): Similarly, but from add0si3_carryin_<optab>.
	(addsi3_carryin_alt2): Similarly, but from addsi3_carryin_alt2_<optab>.
	(addsi3_carryin_clobercc): Similarly.
	(addsi3_carryin_shift): Similarly.  Do not allow register shifts in
	Thumb2 state.

From-SVN: r277171

Now that we early split DImode subtracts, the patterns to emit the
original and to match zero-extend with subtraction or negation are
no-longer useful.

	* config/arm/arm.md (arm_subdi3): Delete insn.
	(zextendsidi_negsi, negdi_extendsidi): Delete insn_and_split.

From-SVN: r277170

This patch adds early splitting of subdi3 so that the individual
operations can be seen by the optimizers, particuarly combine.  This
should allow us to do at least as good a job as previously, but with
far fewer patterns in the machine description.

This is just the initial patch to add the early splitting.  The
cleanups will follow later.

A special trick is used to handle the 'reverse subtract and compare'
where a register is subtracted from a constant.  The natural
comparison

    (COMPARE (const) (reg))

is not canonical in this case and combine will never correctly
generate it (trying to swap the order of the operands.  To handle this
we write the comparison as

    (COMPARE (NOT (reg)) (~const)),

which has the same result for EQ, NE, LTU, LEU, GTU and GEU, which are
all the cases we are really interested in here.

Finally, we delete the negdi2 pattern.  The generic expanders will use
our new subdi3 expander if this pattern is missing and that can handle
the negate case just fine.

	* config/arm/arm-modes.def (CC_RSB): New CC mode.
	* config/arm/predicates.md (arm_borrow_operation): Handle CC_RSBmode.
	* config/arm/arm.c (arm_select_cc_mode): Detect when we should
	return CC_RSBmode.
	(maybe_get_arm_condition_code): Handle CC_RSBmode.
	* config/arm/arm.md (subsi3_carryin): Make this pattern available to
	expand.
	(subdi3): Rewrite to early-expand the sub-operations.
	(rsb_im_compare): New pattern.
	(negdi2): Delete.
	(negdi2_insn): Delete.
	(arm_negsi2): Correct type attribute to alu_imm.
	(negsi2_0compare): New insn pattern.
	(negsi2_carryin): New insn pattern.

From-SVN: r277169

addsi3_carryin_alt2 has a more strict constraint than the predicate
when adding a constant.  This leads to sub-optimal code in some
circumstances.

	* config/arm/arm.md (addsi3_carryin_alt2): Use arm_not_operand for
	operand 2.

From-SVN: r277168

The add-with-carry operation which involves a shift doesn't match at present
because it isn't matching the canonical form generated by combine.  Fixing
this is simply a matter of re-ordering the operands.

	* config/arm/arm.md (addsi3_carryin_shift_<optab>): Reorder operands
	to match canonical form.

From-SVN: r277167

This patch changes the insn patterns for zero- and sign-extend into
define_expands that generate the appropriate word operations
immediately.

	* config/arm/arm.md (zero_extend<mode>di2): Convert to define_expand.
	(extend<mode>di2): Likewise.

From-SVN: r277166

This patch causes the expansion of adddi3 to split the operation
immediately for Arm and Thumb-2.  This is desirable as it frees up the
register allocator to pick what ever combination of registers suits
best and reduces the number of auxiliary patterns that we need in the
back-end.  Three of the testcases that we disabled earlier are already
fixed by this patch.  Finally, we add a new pattern to match the
canonicalization of add-with-carry when using an immediate of zero.

gcc:
	* config/arm/arm-protos.h (arm_decompose_di_binop): New prototype.
	* config/arm/arm.c (arm_decompose_di_binop): New function.
	* config/arm/arm.md (adddi3): Also accept any const_int for op2.
	If not generating Thumb-1 code, decompose the operation into 32-bit
	pieces.
	* add0si_carryin_<optab>: New pattern.

testsuite:
	* gcc.target/arm/pr53447-1.c: Remove XFAIL.
	* gcc.target/arm/pr53447-3.c: Remove XFAIL.
	* gcc.target/arm/pr53447-4.c: Remove XFAIL.

From-SVN: r277165

The first step towards early splitting of addition and subtraction at
DImode is to rip out the old patterns that are designed to propagate
DImode through the RTL optimization passes and the do late splitting.

This patch does cause some code size regressions, but it should still
execute correctly.  We will progressively add back the optimizations
we had here in later patches.

A small number of tests in the Arm-specific testsuite do fail as a
result of this patch, but that's to be expected, since the
optimizations they are looking for have just been removed.  I've kept
the tests, but XFAILed them for now.

One small technical change is also done in this patch as part of the
cleanup: the uaddv<mode>4 expander is changed to use LTU as the branch
comparison.  This eliminates the need for CC_Cmode to recognize
somewhat bogus equality constraints.

gcc:
	* arm.md (adddi3): Only accept register operands.
	(arm_adddi3): Convert to simple insn with no split.  Do not accept
	constants.
	(adddi_sesidi_di): Delete patern.
	(adddi_zesidi_di): Likewise.
	(uaddv<mode>4): Use LTU as condition for branch.
	(adddi3_compareV): Convert to simple insn with no split.
	(addsi3_compareV_upper): Delete pattern.
	(adddi3_compareC): Convert to simple insn with no split.  Correct
	flags setting expression.
	(addsi3_compareC_upper): Delete pattern.
	(addsi3_compareC): Correct flags setting expression.
	(subdi3_compare1): Convert to simple insn with no split.
	(subsi3_carryin_compare): Delete pattern.
	(arm_subdi3): Convert to simple insn with no split.
	(subdi_zesidi): Delete pattern.
	(subdi_di_sesidi): Delete pattern.
	(subdi_zesidi_di): Delete pattern.
	(subdi_sesidi_di): Delete pattern.
	(subdi_zesidi_zesidi): Delete pattern.
	(negvdi3): Use s_register_operand.
	(negdi2_compare): Convert to simple insn with no split.
	(negdi2_insn): Likewise.
	(negsi2_carryin_compare): Delete pattern.
	(negdi_zero_extendsidi): Delete pattern.
	(arm_cmpdi_insn): Convert to simple insn with no split.
	(negdi2): Don't call gen_negdi2_neon.
	* config/arm/neon.md (adddi3_neon): Delete pattern.
	(subdi3_neon): Delete pattern.
	(negdi2_neon): Delete pattern.
	(splits for negdi2_neon): Delete splits.

testsuite:
	* gcc.target/arm/negdi-3.c: Add XFAILS.
	* gcc.target/arm/pr3447-1.c: Likewise.
	* gcc.target/arm/pr3447-3.c: Likewise.
	* gcc.target/arm/pr3447-4.c: Likewise.

From-SVN: r277164

2019-10-18  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/69455
	* trans-decl.c (generate_local_decl): Avoid misconstructed
	intrinsic modules in a BLOCK construct.

2019-10-18  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/69455
	* gfortran.dg/pr69455_1.f90: New test.
	* gfortran.dg/pr69455_2.f90: Ditto.

From-SVN: r277158

	PR middle-end/92153
	* ggc-page.c (release_pages): Read g->alloc_size before free rather
	than after it.

From-SVN: r277157

This patch maps multilibs using -march=armv7-r+vfpv3-d16-fp16 and
-march=armv7-r+vfpv3-d16-fp16+idiv to v7+fp.  This patch also adds a new
multilib for armv7-r+fp.sp and maps -march=armv7-r+fp.sp+idiv,
-march=armv7-r+vfpv3xd-fp16 and -march=armv7-r+vfpv3xd-fp16+idiv to it.

This patch also makes it so that the generated multilib header file is
regenerated if changes have been made to either t-multilib, t-aprofile or
t-rmprofile when doing incremental builds.

gcc/ChangeLog:
2019-10-18  Andre Vieira  <andre.simoesdiasvieira@arm.com>

	* config/arm/t-multilib: Add rule to regenerate mutlilib header file
	with any change to t-multilib, t-aprofile and t-rmprofile.  Also add
	new multilib variants and new mappings.

gcc/testsuite/ChangeLog:
2019-10-18  Andre Vieira  <andre.simoesdiasvieira@arm.com>

	* gcc.target/arm/multilib.exp: Add extra tests.

From-SVN: r277156

https://gcc.gnu.org/ml/gcc-patches/2019-10/msg01354.html
I noticed that we use a bitfield flag to note types with names for linkage
purposes:
  typedef struct {} foo;
but, we can infer this by comparing TYPE_STUB_DECL and TYPE_DECL of the
main variant.  It's only checked in two places -- the C++ parser
and the objective C++ encoder.  
	* cp-tree.h (struct lang_type): Remove was_anonymous.
	(TYPE_WAS_UNNAMED): Implement by checking TYPE_DECL &
	TYPE_STUB_DECL.
	* decl.c (name_unnamed_type): Don't set TYPE_WAS_UNNAMED.

From-SVN: r277155

        gcc/fortran/
        PR fortran/91586
        * class.c (gfc_find_derived_vtab): Return NULL
        instead of deref'ing NULL pointer.

        gcc/testsuite/
        PR fortran/91586
        * gfortran.dg/class_71.f90: New.

From-SVN: r277153

OS X 10.15 adds aligned_alloc but it has the same restriction as the AIX
version, namely that alignments smaller than sizeof(void*) are not
supported.

	PR libstdc++/92143
	* libsupc++/new_opa.cc (operator new) [__APPLE__]: Increase alignment
	to at least sizeof(void*).

From-SVN: r277151

	* include/bits/range_cmp.h (ranges::less::operator()): Inline the
	logic from std::less::operator() to remove the dependency on it.

From-SVN: r277150

	PR target/86040
	* config/avr/avr.c (avr_out_lpm): Do not shortcut-return.

From-SVN: r277143

gcc/testsuite/
	Fix some fallout for small targets.

	PR testsuite/52641
	* gcc.c-torture/execute/20190820-1.c:
	Add dg-require-effective-target int32plus.
	* gcc.c-torture/execute/pr85331.c
	Add dg-require-effective-target double64plus.
	* gcc.dg/pow-sqrt-1.c: Same.
	* gcc.dg/pow-sqrt-2.c: Same.
	* gcc.dg/pow-sqrt-3.c: Same.
	* gcc.c-torture/execute/20190901-1.c: Same.
	* gcc.c-torture/execute/user-printf.c [avr]: Skip.
	* gcc.c-torture/execute/fprintf-2.c [avr]: Skip.
	* gcc.c-torture/execute/printf-2.c [avr]: Skip.
	* gcc.dg/Wlarger-than3.c [avr]: Skip.
	* gcc.c-torture/execute/ieee/20041213-1.c (sqrt)
	[avr,double=float]: Provide custom prototype.
	* gcc.dg/pr36017.c: Same.
	* gcc.c-torture/execute/pr90025.c: Use 32-bit int.
	* gcc.dg/complex-7.c: Add dg-require-effective-target double64.
	* gcc.dg/loop-versioning-1.c:
	Add dg-require-effective-target size32plus.
	* gcc.dg/loop-versioning-2.c: Same.

From-SVN: r277142

2019-10-18  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>
	    Richard Sandiford  <richard.sandiford@arm.com>

	PR target/86753
	* tree-vectorizer.h (scalar_cond_masked_key): New struct,
	and define hashmap traits for it.
	(loop_vec_info::scalar_cond_masked_set): New member.
	(vect_record_loop_mask): Adjust prototype.
	* tree-vectorizer.c (scalar_cond_masked_key::get_cond_ops_from_tree):
	Implement method.
	* tree-vect-loop.c (vectorizable_reduction): Pass NULL as last arg to
	vect_record_loop_mask.
	(vectorizable_live_operation): Likewise.
	(vect_record_loop_mask): New param scalar_mask. Add entry
	cond, loop_mask	to scalar_cond_masked_set if scalar_mask is non NULL.
	* tree-vect-stmts.c (check_load_store_masking): New param scalar_mask.
	Pass it as last arg to vect_record_loop_mask.
	(vectorizable_call): Pass scalar_mask as last arg to
	vect_record_loop_mask.
	(vectorizable_store): Likewise.
	(vectorizable_load): Likewise.
	(vectorizable_condition): Check if another part of vectorized code
	applies loop_mask to condition or to it's inverse, and if yes,
	apply loop_mask to result of vector comparison.

testsuite/
	* gcc.target/aarch64/sve/cond_cnot_2.c: Remove XFAIL
	from { scan-assembler-not {\tsel\t}.
	* gcc.target/aarch64/sve/cond_convert_1.c: Adjust to make
	only one load conditional.
	* gcc.target/aarch64/sve/cond_convert_4.c: Likewise.
	* gcc.target/aarch64/sve/cond_unary_2.c: Likewise.
	* gcc.target/aarch64/sve/vcond_4.c: Remove XFAIL's.
	* gcc.target/aarch64/sve/vcond_5.c: Likewise.

Co-Authored-By: Richard Sandiford <richard.sandiford@arm.com>

From-SVN: r277141

From-SVN: r277140

	* config/pa/pa.c (pa_output_indirect_call): Fix typos in last change.

From-SVN: r277135

	PR tree-optimization/92056
	* tree-ssa-strlen.c (determine_min_objsize): Call init_object_sizes
	before calling compute_builtin_object_size.

	* gcc.dg/tree-ssa/pr92056.c: New test.

From-SVN: r277134

/cp
2019-10-17  Paolo Carlini  <paolo.carlini@oracle.com>

	* decl.c (grokfndecl): Remove redundant use of in_system_header_at.
	(compute_array_index_type_loc): Likewise.
	(grokdeclarator): Likewise.
	* error.c (cp_printer): Likewise.
	* lambda.c (add_default_capture): Likewise.
	* parser.c (cp_parser_primary_expression): Likewise.
	(cp_parser_selection_statement): Likewise.
	(cp_parser_toplevel_declaration): Likewise.
	(cp_parser_enumerator_list): Likewise.
	(cp_parser_using_declaration): Likewise.
	(cp_parser_member_declaration): Likewise.
	(cp_parser_exception_specification_opt): Likewise.
	(cp_parser_std_attribute_spec): Likewise.
	* pt.c (do_decl_instantiation): Likewise.
	(do_type_instantiation): Likewise.
	* typeck.c (cp_build_unary_op): Likewise.

	* decl.c (check_tag_decl): Pass to in_system_header_at the same
	location used for the permerror.
	(grokdeclarator): Likewise.

	* decl.c (check_tag_decl): Use locations[ds_typedef] in error_at.

/testsuite
2019-10-17  Paolo Carlini  <paolo.carlini@oracle.com>

	* g++.old-deja/g++.other/decl9.C: Check locations too.

From-SVN: r277133

The current Darwin load/store lo_sum patterns have neither predicate nor
constraint.  This means that most parts of the backend, which rely on
recog() to validate the rtx, can produce invalid combinations/selections.

For 32bit cases this isn't a problem since we can load/store to unaligned
addresses using D-mode insns.

Conversely, for 64bit instructions that use DS mode, this can manifest as
assemble errors (for an assembler that checks the LO14 relocations), or as
crashes caused by wrong offsets (or worse, wrong content for the two LSBs).

What we want to check for "Y" on Darwin is:
  - that the alignment of the Symbols' target is sufficient for DS mode
  - that the offset is suitable for DS mode.
(while looking through the Mach-O PIC unspecs).

So, the patch removes the Darwin-specific lo_sum patterns (we begin using
the movdi_internal64 patterns).  We also we need to extend the handling of the
mem_operand_gpr constraint to allow looking through Mach-O PIC UNSPECs in
the lo_sum cases.

gcc/ChangeLog:

2019-10-17  Iain Sandoe  <iain@sandoe.co.uk>

	PR target/65342
	* config/rs6000/darwin.md (movdi_low, movsi_low_st): Delete.
	(movdi_low_st): Delete.
	* config/rs6000/rs6000.c
	(darwin_rs6000_legitimate_lo_sum_const_p): New.
	(mem_operand_gpr): Validate Mach-O LO_SUM cases separately.
	* config/rs6000/rs6000.md (movsi_low): Delete.

From-SVN: r277130

	* .gitattributes: Avoid {} in filename pattern.

Brace-expansion is a bash feature, not part of glob(7).

From-SVN: r277129

	* cp-gimplify.c (cp_gimplify_expr): Use get_initialized_tmp_var.

The comment for get_formal_tmp_var says that it shouldn't be used for
expressions whose value might change between initialization and use, and in
this case we're creating a temporary precisely because the value might
change, so we should use get_initialized_tmp_var instead.

I also noticed that many callers of get_initialized_tmp_var pass NULL for
post_p, so it seems appropriate to make it a default argument.

gcc/
	* gimplify.h (get_initialized_tmp_var): Add default argument to
	post_p.
	* gimplify.c (gimplify_self_mod_expr, gimplify_omp_atomic): Remove
	NULL post_p argument.
	* targhooks (std_gimplify_va_arg_expr): Likewise.

From-SVN: r277128

2019-10-17  Richard Biener  <rguenther@suse.de>

	* tree-vectorizer.h (_stmt_vec_info::cond_reduc_code): Remove.
	(STMT_VINFO_VEC_COND_REDUC_CODE): Likewise.
	* tree-vectorizer.c (vec_info::new_stmt_vec_info): Do not
	initialize STMT_VINFO_VEC_COND_REDUC_CODE.
	* tree-vect-loop.c (vect_is_simple_reduction): Set
	STMT_VINFO_REDUC_CODE.
	(vectorizable_reduction): Remove dead and redundant code, use
	STMT_VINFO_REDUC_CODE instead of STMT_VINFO_VEC_COND_REDUC_CODE.

From-SVN: r277126

This won't do anything by default, because __cplusplus is set to 201402L
when Doxygen runs. If/when that changes, these headers should be
processed.

	* doc/doxygen/user.cfg.in (INPUT): Add new C++17 and C++20 headers.

From-SVN: r277121

Define std::identity, std::ranges::equal_to, std::ranges::not_equal_to,
std::ranges::greater, std::ranges::less, std::ranges::greater_equal and
std::ranges::less_equal.

	* include/Makefile.am: Add new header.
	* include/Makefile.in: Regenerate.
	* include/bits/range_cmp.h: New header for C++20 function objects.
	* include/std/functional: Include new header.
	* testsuite/20_util/function_objects/identity/1.cc: New test.
	* testsuite/20_util/function_objects/range.cmp/equal_to.cc: New test.
	* testsuite/20_util/function_objects/range.cmp/greater.cc: New test.
	* testsuite/20_util/function_objects/range.cmp/greater_equal.cc: New
	test.
	* testsuite/20_util/function_objects/range.cmp/less.cc: New test.
	* testsuite/20_util/function_objects/range.cmp/less_equal.cc: New test.
	* testsuite/20_util/function_objects/range.cmp/not_equal_to.cc: New
	test.

From-SVN: r277120

	* config/avr/avr.c (avr_option_override): Remove set of
	PARAM_ALLOW_STORE_DATA_RACES.
	* common/config/avr/avr-common.c (avr_option_optimization_table)
	[OPT_LEVELS_ALL]: Turn on -fallow-store-data-races.

From-SVN: r277115

i386.h has

 #define CLEAR_RATIO(speed) ((speed) ? MIN (6, ix86_cost->move_ratio) : 2)

It is impossible to have CLEAR_RATIO > 6.  This patch adds clear_ratio
to processor_costs, sets it to the minimum of 6 and move_ratio in all
cost models and defines CLEAR_RATIO with clear_ratio.

	* config/i386/i386.h (processor_costs): Add clear_ratio.
	(CLEAR_RATIO): Remove MIN and use ix86_cost->clear_ratio.
	* config/i386/x86-tune-costs.h: Set clear_ratio to the minimum
	of 6 and move_ratio in all cost models.

From-SVN: r277114

The container requirements say that for move assignment "All existing
elements of [the target] are either move assigned or destroyed". Some of
our containers currently use __make_move_if_noexcept which makes the
move depend on whether the element type is nothrow move constructible.
This is incorrect, because the standard says we must move assign, not
move or copy depending on the move constructor.

Use make_move_iterator instead so that we move unconditionally. This
ensures existing elements won't be copy assigned.

	PR libstdc++/92124
	* include/bits/forward_list.h
	(_M_move_assign(forward_list&&, false_type)): Do not use
	__make_move_if_noexcept, instead move unconditionally.
	* include/bits/stl_deque.h (_M_move_assign2(deque&&, false_type)):
	Likewise.
	* include/bits/stl_list.h (_M_move_assign(list&&, false_type)):
	Likewise.
	* include/bits/stl_vector.h (_M_move_assign(vector&&, false_type)):
	Likewise.
	* testsuite/23_containers/vector/92124.cc: New test.

From-SVN: r277113

2019-10-17  Richard Biener  <rguenther@suse.de>

	* tree-vect-loop.c (check_reduction_path): Compute reduction
	operation here.
	(vect_is_simple_reduction): Remove special-case of single-stmt
	reduction path detection.

From-SVN: r277112

According to GAS, the Marvell PJ4 CPU has a VFPv3-D16 floating point
unit, but GCC's CPU configuration tables omits this meaning that
-mfpu=auto will not correctly select the FPU.  This patch fixes this
by adding the +fp option to the architecture specification for this
device.

	* config/arm/arm-cpus.in (marvel-pj4): Add +fp to the architecture.

From-SVN: r277111

2019-10-17  Yuliang Wang  <yuliang.wang@arm.com>

gcc/
	* config/aarch64/aarch64-sve2.md (aarch64_sve2_eor3<mode>)
	(aarch64_sve2_nor<mode>, aarch64_sve2_nand<mode>)
	(aarch64_sve2_bsl<mode>, aarch64_sve2_nbsl<mode>)
	(aarch64_sve2_bsl1n<mode>, aarch64_sve2_bsl2n<mode>):
	New combine patterns.
	* config/aarch64/iterators.md (BSL_DUP): New int iterator for the
	above.
	(bsl_1st, bsl_2nd, bsl_dup, bsl_mov): Attributes for the above.

gcc/testsuite/
	* gcc.target/aarch64/sve2/eor3_1.c: New test.
	* gcc.target/aarch64/sve2/nlogic_1.c: As above.
	* gcc.target/aarch64/sve2/nlogic_2.c: As above.
	* gcc.target/aarch64/sve2/bitsel_1.c: As above.
	* gcc.target/aarch64/sve2/bitsel_2.c: As above.
	* gcc.target/aarch64/sve2/bitsel_3.c: As above.
	* gcc.target/aarch64/sve2/bitsel_4.c: As above.

From-SVN: r277110

From-SVN: r277108

	PR tree-optimization/92131
	* tree-vrp.c (value_range_base::dump): Display +INF for both
	pointers and integers when appropriate.

From-SVN: r277107

gcc/ChangeLog:
2019-10-17  Andre Vieira  <andre.simoesdiasvieira@arm.com>

	* tree-vect-loop.c (vect_analyze_loop_2): Use same condition to decide
	when to use versioning threshold.

From-SVN: r277105

gcc/ChangeLog:
2019-10-17  Andre Vieira  <andre.simoesdiasvieira@arm.com>

	* tree-vect-loop.c (determine_peel_for_niter): New function contained
	outlined code from ...
	(vect_analyze_loop_2): ... here.

From-SVN: r277103

https://gcc.gnu.org/ml/gcc-patches/2019-10/msg01283.html
	* decl.c (builtin_function_1): Merge into ...
	(cxx_builtin_function): ... here.  Nadger the decl before maybe
	copying it.  Set the context.
	(cxx_builtin_function_ext_scope): Push to top level, then call
	cxx_builtin_function.

From-SVN: r277102