gcc/ChangeLog:
	* config/frv/frv-protos.h (frv_ifcvt_modify_insn): Strengthen 3rd
	param from rtx to rtx_insn *.
	* config/frv/frv.c (frv_ifcvt_add_insn): Likewise for "insn"
	param.
	(frv_ifcvt_modify_insn): Likwise.
	(frv_ifcvt_modify_final): Likwise for local "existing_insn",
	adding an as_a <rtx_insn *> cast.  Likewise for local "insn".
	* config/mips/mips.c (r10k_insert_cache_barriers): Add an
	as_a <rtx_insn *> cast to local "unprotected_region" once
	it's been established that it's not NULL or pc_rtx.
	* config/nds32/nds32-relax-opt.c (nds32_group_insns): Strengthen
	param "sethi" from rtx to rtx_insn *.
	(nds32_group_float_insns): Likewise for param "insn".
	* config/vax/vax-protos.h (vax_output_int_add): Likewise for 1st
	param.
	(vax_output_int_subtract): Likewise.
	* config/vax/vax.c (vax_output_int_add): Likewise for param
	"insn".
	(vax_output_int_subtract): Likewise.
	* emit-rtl.c (set_insn_deleted): Likewise, removing cast.
	(emit_pattern_after): Likewise for param "after".
	(emit_insn_after): Likewise.
	(emit_jump_insn_after): Likewise.
	(emit_call_insn_after): Likewise.
	(emit_debug_insn_after): Likewise.
	(emit_pattern_before): Likewise for param "before".
	(emit_insn_before): Likewise.
	(emit_jump_insn_before): Likewise.
	* final.c (get_insn_template): Likewise for param "insn", removing
	a cast.
	* output.h (get_insn_template): Likewise for 2nd param.
	* rtl.h (emit_insn_before): Likewise.
	(emit_jump_insn_before): Likewise.
	(emit_debug_insn_before_noloc): Likewise.
	(emit_insn_after): Likewise.
	(emit_jump_insn_after): Likewise.
	(emit_call_insn_after): Likewise.
	(emit_debug_insn_after): Likewise.
	(set_insn_deleted): Likewise for param.

From-SVN: r261715

[gcc]
2018-06-18  Michael Meissner  <meissner@linux.ibm.com>

	PR target/85358
	* config/rs6000/rs6000-modes.def (toplevel): Rework the 128-bit
	floating point modes, so that IFmode is numerically greater than
	TFmode, which is greater than KFmode using FRACTIONAL_FLOAT_MODE
	to declare the ordering.  This prevents IFmode from being
	converted to TFmode when long double is IEEE 128-bit on an ISA 3.0
	machine.  Include rs6000-modes.h to share the fractional values
	between genmodes* and the rest of the compiler.
	(IFmode): Likewise.
	(KFmode): Likewise.
	(TFmode): Likewise.
	* config/rs6000/rs6000-modes.h: New file.
	* config/rs6000/rs6000.c (rs6000_debug_reg_global): Change the
	meaning of rs6000_long_double_size so that 126..128 selects an
	appropriate 128-bit floating point type.
	(rs6000_option_override_internal): Likewise.
	* config/rs6000/rs6000.h (toplevel): Include rs6000-modes.h.
	(TARGET_LONG_DOUBLE_128): Change the meaning of
	rs6000_long_double_size so that 126..128 selects an appropriate
	128-bit floating point type.
	(LONG_DOUBLE_TYPE_SIZE): Update comment.
	* config/rs6000/rs6000.md (trunciftf2): Correct the modes of the
	source and destination to match the standard usage.
	(truncifkf2): Likewise.
	(copysign<mode>3, IEEE iterator): Rework copysign of float128 on
	ISA 2.07 to use an explicit clobber, instead of passing in a
	temporary.
	(copysign<mode>3_soft): Likewise.

[libgcc]
2018-06-18  Michael Meissner  <meissner@linux.ibm.com>

	* config/rs6000/t-float128 (FP128_CFLAGS_SW): Compile float128
	support modules with -mno-gnu-attribute.
	* config/rs6000/t-float128-hw (FP128_CFLAGS_HW): Likewise.

From-SVN: r261712

By only defining these operators as friends (with no namespace-scope
declaration) they can only be found by ADL and do not participate in
overload resolution for arguments of types other than path.

	LWG 2989 hide path iostream operators from normal lookup
	* include/bits/fs_path.h (operator<<, operator>>): Define inline as
	friends.
	* testsuite/27_io/filesystem/path/io/dr2989.cc: New.

From-SVN: r261711

gcc/ChangeLog:
	* tree-vect-data-refs.c (vect_analyze_data_ref_dependences):
	Replace dump_printf_loc call with DUMP_VECT_SCOPE.
	(vect_slp_analyze_instance_dependence): Likewise.
	(vect_enhance_data_refs_alignment): Likewise.
	(vect_analyze_data_refs_alignment): Likewise.
	(vect_slp_analyze_and_verify_instance_alignment
	(vect_analyze_data_ref_accesses): Likewise.
	(vect_prune_runtime_alias_test_list): Likewise.
	(vect_analyze_data_refs): Likewise.
	* tree-vect-loop-manip.c (vect_update_inits_of_drs): Likewise.
	* tree-vect-loop.c (vect_determine_vectorization_factor): Likewise.
	(vect_analyze_scalar_cycles_1): Likewise.
	(vect_get_loop_niters): Likewise.
	(vect_analyze_loop_form_1): Likewise.
	(vect_update_vf_for_slp): Likewise.
	(vect_analyze_loop_operations): Likewise.
	(vect_analyze_loop): Likewise.
	(vectorizable_induction): Likewise.
	(vect_transform_loop): Likewise.
	* tree-vect-patterns.c (vect_pattern_recog): Likewise.
	* tree-vect-slp.c (vect_analyze_slp): Likewise.
	(vect_make_slp_decision): Likewise.
	(vect_detect_hybrid_slp): Likewise.
	(vect_slp_analyze_operations): Likewise.
	(vect_slp_bb): Likewise.
	* tree-vect-stmts.c (vect_mark_stmts_to_be_vectorized): Likewise.
	(vectorizable_bswap): Likewise.
	(vectorizable_call): Likewise.
	(vectorizable_simd_clone_call): Likewise.
	(vectorizable_conversion): Likewise.
	(vectorizable_assignment): Likewise.
	(vectorizable_shift): Likewise.
	(vectorizable_operation): Likewise.
	* tree-vectorizer.h (DUMP_VECT_SCOPE): New macro.

From-SVN: r261710

	* pt.c (tsubst_decl): Handle recursive alias instantiation.

From-SVN: r261709

	LWG 3050 Fix cv-qualification of convertibility constraints
	* include/std/chrono (duration, operator*, operator/, operator%): Use
	const-qualified type as source type in is_convertible constraints.
	* testsuite/20_util/duration/arithmetic/dr3050.cc: New.
	* testsuite/20_util/duration/cons/dr3050.cc: New.
	* testsuite/20_util/duration/literals/range.cc: Rename to...
	* testsuite/20_util/duration/literals/range_neg.cc: Here. Adjust
	dg-error lineno.

From-SVN: r261708

2018-06-18  Maya Rashish  <coypu@sdf.org>

	* crossconfig.m4: Handle OpenBSD just like NetBSD.
	* configure: Rebuilt.

	* config/alpha/openbsd.h (TARGET_DEFAULT): Define.
	(LINK_SPEC, STARTFILE_SPEC, ENDFILE_SPEC): Likewise.
	(INTMAX_TYPE, UINTMAX_TYPE, WINT_TYPE): Likewise.

	* config/alpha/elf.h (STARTFILE_SPEC, ENDFILE_SPEC): Move from
	here to ...
	* config/alpha/linux.h (STARTFILE_SPEC, ENDFILE_SPEC): Here.

From-SVN: r261707

	* include/Makefile.am: Add new header.
	* include/Makefile.in: Regenerate.
	* include/bits/c++config: Change doxygen comment to suggest <version>
	instead of <iosfwd>.
	* include/precompiled/stdc++.h: Include <cwchar> and <cwctype>
	unconditionally.  Add C++17 and C++20 headers.
	* include/std/version: New header.
	* testsuite/17_intro/headers/c++2017/all_attributes.cc: New.
	* testsuite/17_intro/headers/c++2017/all_no_exceptions.cc: New.
	* testsuite/17_intro/headers/c++2017/all_no_rtti.cc: New.
	* testsuite/17_intro/headers/c++2017/all_pedantic_errors.cc: New.
	* testsuite/17_intro/headers/c++2017/operator_names.cc: New.
	* testsuite/17_intro/headers/c++2017/stdc++.cc: New.
	* testsuite/17_intro/headers/c++2017/stdc++_multiple_inclusion.cc:
	New.
	* testsuite/17_intro/headers/c++2020/all_attributes.cc: New.
	* testsuite/17_intro/headers/c++2020/all_no_exceptions.cc: New.
	* testsuite/17_intro/headers/c++2020/all_no_rtti.cc: New.
	* testsuite/17_intro/headers/c++2020/all_pedantic_errors.cc: New.
	* testsuite/17_intro/headers/c++2020/operator_names.cc: New.
	* testsuite/17_intro/headers/c++2020/stdc++.cc: New.
	* testsuite/17_intro/headers/c++2020/stdc++_multiple_inclusion.cc:
	New.
	* testsuite/18_support/headers/version/macros.cc: New.
	* testsuite/18_support/headers/version/macros.cc: New.

From-SVN: r261706

gcc/ChangeLog:

	PR tree-optimization/81384
	* builtin-types.def (BT_FN_SIZE_CONST_STRING_SIZE): New.
	* builtins.c (expand_builtin_strnlen): New function.
	(expand_builtin): Call it.
	(fold_builtin_n): Avoid setting TREE_NO_WARNING.
	* builtins.def (BUILT_IN_STRNLEN): New.
	* calls.c (maybe_warn_nonstring_arg): Handle BUILT_IN_STRNLEN.
	Warn for bounds in excess of maximum object size.
	* tree-ssa-strlen.c (maybe_set_strlen_range): Return tree representing
	single-value ranges.  Handle strnlen.
	(handle_builtin_strlen): Handle strnlen.
	(strlen_check_and_optimize_stmt): Same.
	* doc/extend.texi (Other Builtins): Document strnlen.

gcc/testsuite/ChangeLog:

	PR tree-optimization/81384
	* gcc.c-torture/execute/builtins/lib/strnlen.c: New test.
	* gcc.c-torture/execute/builtins/strnlen-lib.c: New test.
	* gcc.c-torture/execute/builtins/strnlen.c: New test.
	* gcc.dg/attr-nonstring-2.c: New test.
	* gcc.dg/attr-nonstring-3.c: New test.
	* gcc.dg/attr-nonstring-4.c: New test.
	* gcc.dg/strlenopt-45.c: New test.
	* gcc.dg/strlenopt.h (strnlen):  Declare.

From-SVN: r261705

The AC_CHECK_FUNCS tests cause the build to fail for bare metal cross
compilers, where link tests are not allowed. Replace them with
GCC_TRY_COMPILE_OR_LINK tests instead. Skip all the Filesystem
dependency checks if not building the filesystem library.

	* acinclude.m4 (GLIBCXX_CHECK_FILESYSTEM_DEPS): Only check when
	enable_libstdcxx_filesystem_ts = yes. Check for link, readlink and
	symlink.
	* config.h.in: Regenerate.
	* configure: Regenerate.
	* configure.ac: Remove AC_CHECK_FUNCS for link, readlink and symlink.

From-SVN: r261704

	LWG 3035. std::allocator's constructors should be constexpr
	* include/bits/allocator.h (allocator): Add constexpr to constructors
	for C++2a. Replace dynamic exception specifications with NOTHROW
	macro.
	(allocator, operator==, operator!=): Replace USE_NOEXCEPT macro with
	NOTHROW.
	* include/bits/c++config (_GLIBCXX20_CONSTEXPR): Define.
	* include/ext/malloc_allocator.h (malloc_allocator): Add constexpr
	to constructors for C++2a.
	* include/ext/new_allocator.h (new_allocator): Likewise.

From-SVN: r261703

decl.c (duplicate_decls): Consistently use DECL_SOURCE_LOCATION in errors about redefined default...

2018-06-18  Paolo Carlini  <paolo.carlini@oracle.com>

	* decl.c (duplicate_decls): Consistently use DECL_SOURCE_LOCATION
	in errors about redefined default arguments; tidy.

From-SVN: r261702

2018-06-18  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>

	* tree.c (escaped_string::escape): Replace cast to char * by
	const_cast<char *> (unescaped).

From-SVN: r261700

Add missing target pthread to ensure test doesn't fail on bare-metal
targets. Committed as obvious.

    testsuite/
	PR tree-optimization/86076
	* gcc.dg/pr86076.c: Add target pthread for bare-metal targets.

From-SVN: r261699

Since PR64946 has been fixed, we can remove the xfail from this test.
Committed as obvious.

    testsuite/
	PR tree-optimization/64946
	* gcc.target/aarch64/vect-abs-compile.c: Remove xfail.

From-SVN: r261698

	PR 84195
	* tree.c (escaped_string): New class.  Converts an unescaped
	string into its escaped equivalent.
	(warn_deprecated_use): Use the new class to convert the
	deprecation message, if present.
	(test_escaped_strings): New self test.
	(test_c_tests): Add test_escaped_strings.

From-SVN: r261697

	* tree.c (decl_value_expr_lookup): Revert latest change.
	(decl_value_expr_insert): Likewise.
fortran/
	* trans-decl.c (gfc_get_fake_result_decl): Revert latest change.

From-SVN: r261696

From-SVN: r261695

From-SVN: r261688

	* gimplify.c (nonlocal_vlas): Delete.
	(nonlocal_vla_vars): Likewise.
	(gimplify_var_or_parm_decl): Do not add debug VAR_DECLs for non-local
	referenced VLAs.
	(gimplify_body): Do not create and destroy nonlocal_vlas.
	* tree-nested.c: Include diagnostic.h.
	(use_pointer_in_frame): Tweak.
	(lookup_field_for_decl): Add assertion and declare the transformation.
	(convert_nonlocal_reference_op) <PARM_DECL>: Rework and issue an
	internal error when the reference is in a wrong context.  Do not
	create a debug decl by default.
	(note_nonlocal_block_vlas): Delete.
	(convert_nonlocal_reference_stmt) <GIMPLE_BIND>: Do not call it.
	(convert_local_reference_op) <PARM_DECL>: Skip the frame decl.  Do not
	create a debug decl by default.
	(convert_gimple_call) <GIMPLE_CALL>: Issue an internal error when the
	call is in a wrong context.
	(fixup_vla_decls): New function.
	(finalize_nesting_tree_1): Adjust comment.  Call fixup_vla_decls if no
	debug variables were created.
	* tree.c (decl_value_expr_lookup): Add checking assertion.
	(decl_value_expr_insert): Likewise.
fortran/
	* fortran/trans-decl.c (nonlocal_dummy_decl_pset): Delete.
	(nonlocal_dummy_decls): Likewise.
	(gfc_nonlocal_dummy_array_decl): Likewise.
	(gfc_get_symbol_decl): Do not call gfc_nonlocal_dummy_array_decl.
	(gfc_get_fake_result_decl): Do not generate a new DECL if simply
	reusing the result of a recursive call.
	(gfc_generate_function_code): Do not create, insert and destroy
	nonlocal_dummy_decls.

From-SVN: r261687

From-SVN: r261686

gcc/ChangeLog:

2018-06-16  Kugan Vivekanandarajah  <kuganv@linaro.org>

	PR middle-end/82479
	* ipa-fnsummary.c (will_be_nonconstant_expr_predicate): Handle CALL_EXPR.
	* tree-scalar-evolution.c (interpret_expr): Likewise.
	(expression_expensive_p): Likewise.
	* tree-ssa-loop-ivopts.c (contains_abnormal_ssa_name_p): Likewise.
	* tree-ssa-loop-niter.c (number_of_iterations_popcount): New.
	(number_of_iterations_exit_assumptions): Use number_of_iterations_popcount.
	(ssa_defined_by_minus_one_stmt_p): New.

gcc/testsuite/ChangeLog:

2018-06-16  Kugan Vivekanandarajah  <kuganv@linaro.org>

	PR middle-end/82479
	* gcc.dg/tree-ssa/popcount.c: New test.
	* gcc.dg/tree-ssa/popcount2.c: New test.

From-SVN: r261682

re PR tree-optimization/64946 ([AArch64] gcc.target/aarch64/vect-abs-compile.c - "abs" vectorization fails for char/short types)

gcc/ChangeLog:

2018-06-16  Kugan Vivekanandarajah  <kuganv@linaro.org>

	PR middle-end/64946
	* cfgexpand.c (expand_debug_expr): Hande ABSU_EXPR.
	* config/i386/i386.c (ix86_add_stmt_cost): Likewise.
	* dojump.c (do_jump): Likewise.
	* expr.c (expand_expr_real_2): Check operand type's sign.
	* fold-const.c (const_unop): Handle ABSU_EXPR.
	(fold_abs_const): Likewise.
	* gimple-pretty-print.c (dump_unary_rhs): Likewise.
	* gimple-ssa-backprop.c (backprop::process_assign_use): Likesie.
	(strip_sign_op_1): Likesise.
	* match.pd: Add new pattern to generate ABSU_EXPR.
	* optabs-tree.c (optab_for_tree_code): Handle ABSU_EXPR.
	* tree-cfg.c (verify_gimple_assign_unary): Likewise.
	* tree-eh.c (operation_could_trap_helper_p): Likewise.
	* tree-inline.c (estimate_operator_cost): Likewise.
	* tree-pretty-print.c (dump_generic_node): Likewise.
	* tree-vect-patterns.c (vect_recog_sad_pattern): Likewise.
	* tree.def (ABSU_EXPR): New.

gcc/c-family/ChangeLog:

2018-06-16  Kugan Vivekanandarajah  <kuganv@linaro.org>

	* c-common.c (c_common_truthvalue_conversion): Handle ABSU_EXPR.

gcc/c/ChangeLog:

2018-06-16  Kugan Vivekanandarajah  <kuganv@linaro.org>

	* c-typeck.c (build_unary_op): Handle ABSU_EXPR;
	* gimple-parser.c (c_parser_gimple_statement): Likewise.
	(c_parser_gimple_unary_expression): Likewise.

gcc/cp/ChangeLog:

2018-06-16  Kugan Vivekanandarajah  <kuganv@linaro.org>

	* constexpr.c (potential_constant_expression_1): Handle ABSU_EXPR.
	* cp-gimplify.c (cp_fold): Likewise.

gcc/testsuite/ChangeLog:

2018-06-16  Kugan Vivekanandarajah  <kuganv@linaro.org>

	PR middle-end/64946
	* gcc.dg/absu.c: New test.
	* gcc.dg/gimplefe-29.c: New test.
	* gcc.target/aarch64/pr64946.c: New test.

From-SVN: r261681

re PR middle-end/86095 (documentation for -Wunsafe-loop-optimizations references options which have no effect any more)

	PR middle-end/86095
	* common.opt (Wunsafe-loop-optimizations): Add Ignore, remove Var,
	documented as preserved for backward compatibility only.
	* doc/invoke.texi: Remove -Wunsafe-loop-optimizations documentation.

From-SVN: r261679

	PR rtl-optimization/86108
	* bb-reorder.c (create_forwarder_block): Renamed to ...
	(create_eh_forwarder_block): ... this.  Split OLD_BB after labels and
	jump from new landing pad to the second part.
	(sjlj_fix_up_crossing_landing_pad, dw2_fix_up_crossing_landing_pad):
	Adjust callers.

From-SVN: r261678

	* expr.c (mark_use): Look through NOP_EXPR.

From-SVN: r261676

	* config.guess: Import latest version.
	* config.sub: Likewise.

From-SVN: r261675

From-SVN: r261674

When deduction guides are supported by the compiler (i.e. for C++17 and
later) replace two basic_string constructors by constrained function
templates as required by LWG 3075. In order to ensure that the pre-C++17
non-template constructors are still exported from the shared library
define a macro in src/c++11/string-inst.cc to force the non-template
declarations (this isn't strictly needed yet, because the string
instantiations are compiled with -std=gnu++11, but that is likely to
change).

	LWG 3076 basic_string CTAD ambiguity
	* doc/xml/manual/intro.xml: Document LWG 3076 change.
	* include/bits/basic_string.h
	[__cpp_deduction_guides && !_GLIBCXX_DEFINING_STRING_INSTANTIATIONS]
	(basic_string(const _CharT*, const _Alloc&)): Turn into a function
	template constrained by _RequireAllocator.
	(basic_string(size_type, _CharT, const _Alloc&)): Likewise.
	* src/c++11/string-inst.cc (_GLIBCXX_DEFINING_STRING_INSTANTIATIONS):
	Define.
	* testsuite/21_strings/basic_string/cons/char/deduction.cc: Test
	deduction
	* testsuite/21_strings/basic_string/cons/wchar_t/deduction.cc:
	Likewise.

From-SVN: r261670

	PR c/86093
	* c-typeck.c (pointer_diff): Cast both pointers to unqualified types
	before doing POINTER_DIFF_EXPR.

	* c-c++-common/pr86093.c: New test.

From-SVN: r261663

	PR middle-end/85878
	* expr.c (expand_assignment): Remove now redundant COMPLEX_MODE_P
	check from first store_expr, use to_mode instead of GET_MODE (to_rtx).
	Only call store_expr for halves if the mode is the same.

	* gfortran.fortran-torture/compile/pr85878.f90: New test.

From-SVN: r261659

	* pt.c (tsubst_default_argument): Use push_to/pop_from_top_level.

	* name-lookup.c (do_pushtag): Don't look through complete types, but
	don't add to them either.  Get context from current_binding_level.

From-SVN: r261656

From-SVN: r261655

	* lambda.c (record_null_lambda_scope): New.
	* pt.c (tsubst_lambda_expr): Use it.
	* name-lookup.c (do_pushtag): Don't give a lambda DECL_CONTEXT of a
	function that isn't open.

From-SVN: r261654

From-SVN: r261653

	PR middle-end/86123
	* match.pd ((X / Y) == 0 -> X < Y): Don't transform complex divisions.
	Fix up comment formatting.

	* gcc.c-torture/compile/pr86123.c: New test.

From-SVN: r261647

2018-06-15  Bernd Edlinger  <bernd.edlinger@hotmail.de>

        * typed-splay-tree.h (typed_splay_tree::remove): New function.
        (typed_splay_tree::closure,
        typed_splay_tree::inner_foreach_fn, typed_splay_tree::m_inner): Deleted.
        (typed_splay_tree::typed_splay_tree,
        typed_splay_tree::operator =): Declared private.
        (typed_splay_tree::splay_tree_key, typed_splay_tree::splay_tree_value,
        typed_splay_tree::splay_tree_node_s, typed_splay_tree::KDEL,
        typed_splay_tree::VDEL, typed_splay_tree::splay_tree_delete_helper,
        typed_splay_tree::rotate_left, typed_splay_tree::rotate_right,
        typed_splay_tree::splay_tree_splay,
        typed_splay_tree::splay_tree_foreach_helper,
        typed_splay_tree::splay_tree_insert,
        typed_splay_tree::splay_tree_remove,
        typed_splay_tree::splay_tree_lookup,
        typed_splay_tree::splay_tree_predecessor,
        typed_splay_tree::splay_tree_successor,
        typed_splay_tree::splay_tree_min,
        typed_splay_tree::splay_tree_max): Took over from splay-tree.c/.h.
        (typed_splay_tree::root, typed_splay_tree::comp,
        typed_splay_tree::delete_key,
        typed_splay_tree::delete_value): New data members.
        * typed-splay-tree.c (selftest::test_str_to_int): Add a test for
        typed_splay_tree::remove.

From-SVN: r261645

2018-06-15  Tom de Vries  <tdevries@suse.de>

	* gcc.dg-selftests/dg-final.exp: Force sequential execution.

From-SVN: r261643

	PR libstdc++/86169
	* include/bits/basic_string.h [!_GLIBCXX_USE_CXX11_ABI]
	(basic_string::data()): Unshare string.
	* testsuite/21_strings/basic_string/operations/data/char/86169.cc:
	New.

From-SVN: r261642

The C++ committee has confirmed that passing a null pointer to the
unary basic_string_view constructor is undefined. This removes the check
from our implementation, and adds the nonnull attribute to warn when the
compiler can detect undefined input.

	* include/std/string_view (basic_string_view(const CharT*)): Remove
	check for null pointer and add nonnull attribute.
	(compare(const CharT*), compare(size_type, size_type, const CharT*))
	(find(const CharT*, size_type), rfind(const CharT*, size_type))
	(find_first_of(const CharT*, size_type))
	(find_last_of(const CharT*, size_type))
	(find_first_not_of(const CharT*, size_type))
	(find_last_not_of(const CharT*, size_type)): Add nonnull attribute.
	* testsuite/21_strings/basic_string_view/cons/char/nonnull.cc: New.
	* testsuite/21_strings/basic_string_view/operations/compare/char/
	nonnull.cc: New.
	* testsuite/21_strings/basic_string_view/operations/find/char/
	nonnull.cc: New.
	* testsuite/21_strings/basic_string_view/operations/rfind/char/
	nonnull.cc: New.

From-SVN: r261638