2017-07-31  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/81581
	* m4/ifuntion.m4 (name`'rtype_qual`_'atype_code): Perform check
	for dim.
	(`m'name`'rtype_qual`_'atype_code): Likewise. Change type of rank
	and tim to index_type.
	(`s'name`'rtype_qual`_'atype_code): Perform check for dim.
	* generated/iall_i16.c: Regenerated.
	* generated/iall_i1.c: Regenerated.
	* generated/iall_i2.c: Regenerated.
	* generated/iall_i4.c: Regenerated.
	* generated/iall_i8.c: Regenerated.
	* generated/iany_i16.c: Regenerated.
	* generated/iany_i1.c: Regenerated.
	* generated/iany_i2.c: Regenerated.
	* generated/iany_i4.c: Regenerated.
	* generated/iany_i8.c: Regenerated.
	* generated/iparity_i16.c: Regenerated.
	* generated/iparity_i1.c: Regenerated.
	* generated/iparity_i2.c: Regenerated.
	* generated/iparity_i4.c: Regenerated.
	* generated/iparity_i8.c: Regenerated.
	* generated/maxloc1_16_i16.c: Regenerated.
	* generated/maxloc1_16_i1.c: Regenerated.
	* generated/maxloc1_16_i2.c: Regenerated.
	* generated/maxloc1_16_i4.c: Regenerated.
	* generated/maxloc1_16_i8.c: Regenerated.
	* generated/maxloc1_16_r10.c: Regenerated.
	* generated/maxloc1_16_r16.c: Regenerated.
	* generated/maxloc1_16_r4.c: Regenerated.
	* generated/maxloc1_16_r8.c: Regenerated.
	* generated/maxloc1_4_i16.c: Regenerated.
	* generated/maxloc1_4_i1.c: Regenerated.
	* generated/maxloc1_4_i2.c: Regenerated.
	* generated/maxloc1_4_i4.c: Regenerated.
	* generated/maxloc1_4_i8.c: Regenerated.
	* generated/maxloc1_4_r10.c: Regenerated.
	* generated/maxloc1_4_r16.c: Regenerated.
	* generated/maxloc1_4_r4.c: Regenerated.
	* generated/maxloc1_4_r8.c: Regenerated.
	* generated/maxloc1_8_i16.c: Regenerated.
	* generated/maxloc1_8_i1.c: Regenerated.
	* generated/maxloc1_8_i2.c: Regenerated.
	* generated/maxloc1_8_i4.c: Regenerated.
	* generated/maxloc1_8_i8.c: Regenerated.
	* generated/maxloc1_8_r10.c: Regenerated.
	* generated/maxloc1_8_r16.c: Regenerated.
	* generated/maxloc1_8_r4.c: Regenerated.
	* generated/maxloc1_8_r8.c: Regenerated.
	* generated/maxval_i16.c: Regenerated.
	* generated/maxval_i1.c: Regenerated.
	* generated/maxval_i2.c: Regenerated.
	* generated/maxval_i4.c: Regenerated.
	* generated/maxval_i8.c: Regenerated.
	* generated/maxval_r10.c: Regenerated.
	* generated/maxval_r16.c: Regenerated.
	* generated/maxval_r4.c: Regenerated.
	* generated/maxval_r8.c: Regenerated.
	* generated/minloc1_16_i16.c: Regenerated.
	* generated/minloc1_16_i1.c: Regenerated.
	* generated/minloc1_16_i2.c: Regenerated.
	* generated/minloc1_16_i4.c: Regenerated.
	* generated/minloc1_16_i8.c: Regenerated.
	* generated/minloc1_16_r10.c: Regenerated.
	* generated/minloc1_16_r16.c: Regenerated.
	* generated/minloc1_16_r4.c: Regenerated.
	* generated/minloc1_16_r8.c: Regenerated.
	* generated/minloc1_4_i16.c: Regenerated.
	* generated/minloc1_4_i1.c: Regenerated.
	* generated/minloc1_4_i2.c: Regenerated.
	* generated/minloc1_4_i4.c: Regenerated.
	* generated/minloc1_4_i8.c: Regenerated.
	* generated/minloc1_4_r10.c: Regenerated.
	* generated/minloc1_4_r16.c: Regenerated.
	* generated/minloc1_4_r4.c: Regenerated.
	* generated/minloc1_4_r8.c: Regenerated.
	* generated/minloc1_8_i16.c: Regenerated.
	* generated/minloc1_8_i1.c: Regenerated.
	* generated/minloc1_8_i2.c: Regenerated.
	* generated/minloc1_8_i4.c: Regenerated.
	* generated/minloc1_8_i8.c: Regenerated.
	* generated/minloc1_8_r10.c: Regenerated.
	* generated/minloc1_8_r16.c: Regenerated.
	* generated/minloc1_8_r4.c: Regenerated.
	* generated/minloc1_8_r8.c: Regenerated.
	* generated/minval_i16.c: Regenerated.
	* generated/minval_i1.c: Regenerated.
	* generated/minval_i2.c: Regenerated.
	* generated/minval_i4.c: Regenerated.
	* generated/minval_i8.c: Regenerated.
	* generated/minval_r10.c: Regenerated.
	* generated/minval_r16.c: Regenerated.
	* generated/minval_r4.c: Regenerated.
	* generated/minval_r8.c: Regenerated.
	* generated/norm2_r10.c: Regenerated.
	* generated/norm2_r16.c: Regenerated.
	* generated/norm2_r4.c: Regenerated.
	* generated/norm2_r8.c: Regenerated.
	* generated/parity_l16.c: Regenerated.
	* generated/parity_l1.c: Regenerated.
	* generated/parity_l2.c: Regenerated.
	* generated/parity_l4.c: Regenerated.
	* generated/parity_l8.c: Regenerated.
	* generated/product_c10.c: Regenerated.
	* generated/product_c16.c: Regenerated.
	* generated/product_c4.c: Regenerated.
	* generated/product_c8.c: Regenerated.
	* generated/product_i16.c: Regenerated.
	* generated/product_i1.c: Regenerated.
	* generated/product_i2.c: Regenerated.
	* generated/product_i4.c: Regenerated.
	* generated/product_i8.c: Regenerated.
	* generated/product_r10.c: Regenerated.
	* generated/product_r16.c: Regenerated.
	* generated/product_r4.c: Regenerated.
	* generated/product_r8.c: Regenerated.
	* generated/sum_c10.c: Regenerated.
	* generated/sum_c16.c: Regenerated.
	* generated/sum_c4.c: Regenerated.
	* generated/sum_c8.c: Regenerated.
	* generated/sum_i16.c: Regenerated.
	* generated/sum_i1.c: Regenerated.
	* generated/sum_i2.c: Regenerated.
	* generated/sum_i4.c: Regenerated.
	* generated/sum_i8.c: Regenerated.
	* generated/sum_r10.c: Regenerated.
	* generated/sum_r16.c: Regenerated.
	* generated/sum_r4.c: Regenerated.
	* generated/sum_r8.c: Regenerated.

2017-07-31  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/81581
	* gfortran.dg/dim_sum_1.f90: New test case.
	* gfortran.dg/dim_sum_2.f90: New test case.
	* gfortran.dg/dim_sum_3.f90: New test case.

From-SVN: r250735

From-SVN: r250734

2017-07-31  Martin Liska  <mliska@suse.cz>

	* gimple-pretty-print.c (dump_gimple_label): Never dump
	BB info.
	(dump_gimple_bb_header): Always dump BB info.
	(pp_cfg_jump): Do not append info about BB when dumping a jump.
2017-07-31  Martin Liska  <mliska@suse.cz>

	* gcc.dg/builtin-unreachable-6.c: Update scanned patterns.
	* gcc.dg/tree-ssa/attr-hotcold-2.c: Likewise.

From-SVN: r250731

2017-07-31  Martin Liska  <mliska@suse.cz>

	PR sanitize/81530
	* cp-gimplify.c (cp_genericize): Guard condition with flag_sanitize_p
	also with current_function_decl non-null equality.
	* cp-ubsan.c (cp_ubsan_instrument_vptr_p): Likewise.
	* decl.c (compute_array_index_type): Likewise.
	* init.c (finish_length_check): Likewise.
	* typeck.c (cp_build_binary_op): Likewise.
2017-07-31  Martin Liska  <mliska@suse.cz>

	PR sanitize/81530
	* c-convert.c (convert): Guard condition with flag_sanitize_p
	also with current_function_decl non-null equality.
	* c-decl.c (grokdeclarator): Likewise.
	* c-typeck.c (build_binary_op): Likewise.
2017-07-31  Martin Liska  <mliska@suse.cz>

	PR sanitize/81530
	* convert.c (convert_to_integer_1): Guard condition with flag_sanitize_p
	also with current_function_decl non-null equality.
2017-07-31  Martin Liska  <mliska@suse.cz>

	PR sanitize/81530
	* c-ubsan.c (ubsan_maybe_instrument_array_ref):
	Guard condition with flag_sanitize_p also with current_function_decl
	non-null equality.
	(ubsan_maybe_instrument_reference_or_call): Likewise.
2017-07-31  Martin Liska  <mliska@suse.cz>

	PR sanitize/81530
	* g++.dg/ubsan/pr81530.C: New test.

From-SVN: r250730

	PR sanitizer/81604
	* ubsan.c (ubsan_type_descriptor): For UBSAN_PRINT_ARRAY don't
	change type to the element type, instead add eltype variable and
	use it where we are interested in the element type.

	* c-c++-common/ubsan/pr81604.c: New test.

From-SVN: r250728

	PR tree-optimization/81603
	* ipa-polymorphic-call.c
	(ipa_polymorphic_call_context::ipa_polymorphic_call_context): Perform
	offset arithmetic in offset_int, bail out if the resulting bit offset
	doesn't fit into shwi.

From-SVN: r250727

2017-07-31  Martin Liska  <mliska@suse.cz>

	* gimplify.c (mostly_copy_tree_r): Remove Java specific hunk.
	(gimplify_save_expr): Fix comment.

From-SVN: r250726

From-SVN: r250725

Since there is an extra error code passed to the exception handler,
INCOMING_FRAME_SP_OFFSET is return address plus error code for the
exception handler.  This patch updates INCOMING_FRAME_SP_OFFSET to
the correct value for the exception handler.

This patch exposed a bug in DWARF stack frame CFI generation, which
assumes that INCOMING_FRAME_SP_OFFSET is the same for all functions:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81570

It sets and caches the incoming stack frame offset with the same
INCOMING_FRAME_SP_OFFSET for all functions.  When there are both
exception handler and normal function in the same input, the wrong
incoming stack frame offset is used for exception handler or normal
function, which leads to

FAIL: gcc.dg/guality/pr68037-1.c   -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects  line 33 error == 0x12345670
FAIL: gcc.dg/guality/pr68037-1.c   -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects  line 33 frame->ip == 0x12345671
FAIL: gcc.dg/guality/pr68037-1.c   -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects  line 33 frame->cs == 0x12345672
FAIL: gcc.dg/guality/pr68037-1.c   -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects  line 33 frame->flags == 0x12345673
FAIL: gcc.dg/guality/pr68037-1.c   -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects  line 33 frame->sp == 0x12345674
FAIL: gcc.dg/guality/pr68037-1.c   -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects  line 33 frame->ss == 0x12345675

With the patch for PR 81570:

https://gcc.gnu.org/ml/gcc-patches/2017-07/msg01851.html

applied, there are no regressions on i686 and x86-64.

gcc/

	PR target/79793
	* config/i386/i386.c (ix86_function_arg): Update arguments for
	exception handler.
	(ix86_compute_frame_layout): Set the initial stack offset to
	INCOMING_FRAME_SP_OFFSET.  Update red-zone offset with
	INCOMING_FRAME_SP_OFFSET.
	(ix86_expand_epilogue): Don't pop the 'ERROR_CODE' off the
	stack before exception handler returns.
	* config/i386/i386.h (INCOMING_FRAME_SP_OFFSET): Add the
	the 'ERROR_CODE' for exception handler.

gcc/testsuite/

	PR target/79793
	* gcc.dg/guality/pr68037-1.c: Update gdb breakpoints.
	* gcc.target/i386/interrupt-5.c (interrupt_frame): New struct.
	(foo): Check the builtin return address against the return address
	in interrupt frame.
	* gcc.target/i386/pr79793-1.c: New test.
	* gcc.target/i386/pr79793-2.c: Likewise.

From-SVN: r250721

	* config/i386/i386.h (ASM_PRINTF_EXTENSIONS): New macro.
	(ASM_OUTPUT_REG_PUSH): Rewrite with new operand modifiers.
	(ASM_OUTPUT_REG_POP): Ditto.
	* config/i386/i386.c (ix86_asm_output_function_label): Use fputs
	instead of asm_fprintf to output pure string.

From-SVN: r250720

	* c-format.c (asm_fprintf_char_table): Add 'z' to format_chars.

From-SVN: r250719

From-SVN: r250718

	* c-ada-spec.c (dump_generic_ada_node): Take into account signedness
	for enumeral types.
	(print_ada_declaration): Add missing guard for record types.

From-SVN: r250714

	* debug.h (struct gcc_debug_hooks): Add IMPLICIT argument
	to imported_module_or_decl hook.
	(debug_nothing_tree_tree_tree_bool): Remove.
	(debug_nothing_tree_tree_tree_bool_bool): New declaration.
	* debug.c (do_nothing_debug_hooks): Use
	debug_nothing_tree_tree_tree_bool_bool instead of
	debug_nothing_tree_tree_tree_bool.
	* vmsdbgout.c (vmsdbg_debug_hooks): Likewise.
	* dbxout.c (dbx_debug_hooks, xcoff_debug_hooks): Likewise.
	* sdbout.c (sdb_debug_hooks): Likewise.
	* dwarf2out.c (dwarf2_lineno_debug_hooks): Likewise.
	(gen_namespace_die): Add DW_AT_export_symbols attribute if
	langhook wants it.
	(dwarf2out_imported_module_or_decl): Add IMPLICIT argument,
	if true, -gdwarf-5 and decl will have DW_AT_export_symbols
	attribute, don't add anything.
cp/
	* cp-objcp-common.c (cp_decl_dwarf_attribute): Handle
	DW_AT_export_symbols.
	* name-lookup.c (emit_debug_info_using_namespace): Add IMPLICIT
	argument, pass it through to the debug hook.
	(finish_namespace_using_directive): Adjust
	emit_debug_info_using_namespace caller.
	(push_namespace): Likewise.  Call it after setting
	DECL_NAMESPACE_INLINE_P.
	(cp_emit_debug_info_for_using): Pass false as new argument to
	the imported_module_or_decl debug hook.
fortran/
	* trans-decl.c (gfc_trans_use_stmts): Pass false as new argument to
	the imported_module_or_decl debug hook.
ada/
	* gcc-interface/utils.c (gnat_write_global_declarations): Pass false
	as new argument to the imported_module_or_decl debug hook.
testsuite/
	* g++.dg/debug/dwarf2/inline-ns-1.C: New test.
	* g++.dg/debug/dwarf2/inline-ns-2.C: New test.

From-SVN: r250713

gcc/ChangeLog:

2017-07-28  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* fold-const.c (fold_build1_stat_loc): Remove _stat from name.
	(fold_build2_stat_loc): Likewise.
	(fold_build3_stat_loc): Likewise.
	* fold-const.h (fold_build1, fold_build2, fold_build3): Adjust.
	(fold_build1_loc): Remove macro.
	(fold_build2_loc): Likewise.
	(fold_build3_loc): Likewise.

From-SVN: r250712

gcc/ChangeLog:

2017-07-28  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* gimple.c (gimple_build_debug_bind_stat): Remove _stat from name.
	(gimple_build_debug_bind_source_stat): Likewise.
	* gimple.h (gimple_build_debug_bind): Remove macro.
	(gimple_build_debug_bind_source): Likewise.

From-SVN: r250711

gcc/ChangeLog:

2017-07-28  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* bitmap.c (bitmap_alloc): Adjust.
	(bitmap_gc_alloc): Likewise.
	* bitmap.h (bitmap_initialize_stat): Remove _stat from name.

From-SVN: r250710

gcc/fortran/ChangeLog:

2017-07-28  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* resolve.c (find_reachable_labels): Adjust.

gcc/ChangeLog:

2017-07-28  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* bitmap.c (bitmap_obstack_alloc_stat): Rename to bitmap_alloc.
	(bitmap_gc_alloc_stat): Rename to bitmap_gc_alloc.
	* bitmap.h (bitmap_obstack_alloc_stat): Adjust prototype.
	(bitmap_gc_alloc_stat): Likewise.
	(BITMAP_ALLOC, BITMAP_GGC_ALLOC): Adjust.

From-SVN: r250709

gcc/ChangeLog:

2017-07-28  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* rtl.c (shallow_copy_rtx_stat): Remove _stat from name.
	* rtl.h (shallow_copy_rtx): Remove macro.

From-SVN: r250708

gcc/ChangeLog:

2017-07-28  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* emit-rtl.c (gen_raw_REG): Adjust.
	* gengenrtl.c (gendef): Likewise.
	* rtl.c (rtx_alloc_stat): Remove _stat from name.
	* rtl.h (rtx_alloc): Remove macro.

From-SVN: r250707

gcc/ChangeLog:

2017-07-28  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* tree.c (build_tree_list_vec_stat): Remove _stat from name.
	(build_tree_list_stat): Likewise.
	* tree.h (build_tree_list): Remove macro.
	(build_tree_list_vec): Likewise.

From-SVN: r250706

gcc/ChangeLog:

2017-07-28  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* tree.c (make_vector_stat): Remove _stat from name.
	(build_vector_stat): Likewise.
	* tree.h (make_vector_stat): Remove macro.
	(build_vector_stat): Likewise.

From-SVN: r250705

gcc/ChangeLog:

2017-07-28  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* tree.h (build_var_debug_value): Remove prototype.

From-SVN: r250704

gcc/ChangeLog:

2017-07-28  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* tree.c (tree_cons_stat): Remove _stat from name.
	* tree.h (tree_cons): Remove macro.

From-SVN: r250703

gcc/ChangeLog:

2017-07-28  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* tree.c (build_vl_exp_stat): Remove _stat from name.
	* tree.h (build_vl_exp): Remove macro.

From-SVN: r250702

gcc/ChangeLog:

2017-07-28  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* tree.c (build_decl_stat): Remove _stat from name.
	* tree.h (build_decl): Remove macro.

From-SVN: r250701

gcc/ChangeLog:

2017-07-28  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* gimple.c (gimple_build_with_ops_stat): Adjust.
	(gimple_alloc_stat): Remove _stat from name.
	* gimple.h (gimple_alloc): Remove macro.

From-SVN: r250700

gcc/ChangeLog:

2017-07-28  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* tree.c (make_tree_vec_stat): Remove _stat from name.
	(grow_tree_vec_stat): Likewise.
	* tree.h (make_tree_vec_stat): Adjust prototype.
	(grow_tree_vec_stat): Likewise.
	(make_tree_vec): Remove macro.
	(grow_tree_vec): Likewise.

From-SVN: r250699

gcc/ChangeLog:

2017-07-28  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* fold-const.c (fold_build1_stat_loc): Adjust.
	(fold_build2_stat_loc): Likewise.
	(fold_build3_stat_loc): Likewise.
	* tree.c (build0_stat): Remove _stat from name.
	(build1_stat): Likewise.
	(build2_stat): Likewise.
	(build3_stat): Likewise.
	(build4_stat): Likewise.
	(build5_stat): Likewise.
	* tree.h (build1_loc): Remove macro, and rename _stat function
	to this.
	(build2_loc): Likewise.
	(build3_loc): Likewise.
	(build4_loc): Likewise.
	(build5_loc): Likewise.

From-SVN: r250698

gcc/ChangeLog:

2017-07-28  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* tree.c (make_int_cst_stat): Remove _stat from name.
	* tree.h (make_int_cst_stat): Adjust prototype.
	(make_int_cst): Remove macro.

From-SVN: r250697

gcc/ChangeLog:

2017-07-28  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* tree.c (make_tre_binfo_stat): Remove _stat from name.
	* tree.h (make_tree_binfo_stat): Adjust prototype.
	(make_tree_binfo): Remove.

From-SVN: r250696

gcc/cp/ChangeLog:

2017-07-28  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* lex.c (copy_decl): Adjust.
	(copy_type): Likewise.

gcc/ChangeLog:

2017-07-28  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* tree.c (copy_node_stat): Rename to copy_node.
	(build_distinct_type_copy): Adjust.
	* tree.h (copy_node_stat): Adjust prototype.
	(copy_node): Remove macro.

From-SVN: r250695

gcc/ChangeLog:

2017-07-28  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* tree.c (make_node_stat): rename to make_node.
	(build_tree_list_stat): Adjust.
	(build0_stat): Likewise.
	(build2_stat): Likewise.
	(build3_stat): Likewise.
	(build4_stat): Likewise.
	(build5_stat): Likewise.
	(build_decl_stat): Likewise.
	* tree.h (make_node_stat): Adjust prototype.
	(make_node): remove macro.

From-SVN: r250694

From-SVN: r250693

gcc/
	* config/rs6000/ppc-auxv.h (PPC_FEATURE2_DARN): New define.
	(PPC_FEATURE2_SCV): Likewise.
	* config/rs6000/rs6000.c (cpu_supports_info): Use them.

gcc/testsuite/
	* gcc.target/powerpc/cpu-builtin-1.c (darn, scv): Add tests.

From-SVN: r250687

    
    Tweak Interface_field_reference_expression::do_get_backend to apply an
    additional backend type conversion to the returned result.  This is
    needed due to the fact that the top level type of the expression is a
    function descriptor, however the value being manufactured is a pointer
    to <thunk-descriptor, value> struct.
    
    Reviewed-on: https://go-review.googlesource.com/51712

From-SVN: r250686

2017-07-28  Tony Reix  <tony.reix@atos.net>

        * configure.ac (target-libffi): Don't disable for AIX.
        (go): Don't add to unsupported_languages on AIX.
        (target-libgo): Don't disable for AIX.
        * configure: Regenerate.

From-SVN: r250685

From-SVN: r250684

    
    We recently started walking through the hash table of pointer types to
    finalize them.  Unfortunately it is possible to create a new pointer
    type while finalizing an existing one (test case: test/fixedbugs/issue5291)
    and that breaks the iteration.  So, instead, keep a list of
    placeholder pointer types, and iterate through them while permitting
    the list to be extended as we go.
    
    Reviewed-on: https://go-review.googlesource.com/51771

From-SVN: r250683

    
    For calls that return multiple results we used to create a temporary
    of struct type to hold the results, and also create a separate
    temporary for each result.  Then the call expression would copy each
    result out of the struct to the temporary, and Call_result_expression
    would refer to the desired temporary.
    
    Simplify this to just use a single temporary of struct type, and
    change Call_result_expression to fetch a field of the struct.
    
    This may reduce some incorrect tree sharing in the backend code.
    
    Reviewed-on: https://go-review.googlesource.com/51770

From-SVN: r250682