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New builtin to enable explicit use of PAREN_EXPR in C & C++ code. Signed-off-by: Matthias Kretz <m.kretz@gsi.de> gcc/testsuite/ChangeLog: * c-c++-common/builtin-assoc-barrier-1.c: New test. gcc/cp/ChangeLog: * constexpr.c (cxx_eval_constant_expression): Handle PAREN_EXPR via cxx_eval_constant_expression. * cp-objcp-common.c (names_builtin_p): Handle RID_BUILTIN_ASSOC_BARRIER. * cp-tree.h: Adjust TREE_LANG_FLAG documentation to include PAREN_EXPR in REF_PARENTHESIZED_P. (REF_PARENTHESIZED_P): Add PAREN_EXPR. * parser.c (cp_parser_postfix_expression): Handle RID_BUILTIN_ASSOC_BARRIER. * pt.c (tsubst_copy_and_build): If the PAREN_EXPR is not a parenthesized initializer, build a new PAREN_EXPR. * semantics.c (force_paren_expr): Simplify conditionals. Set REF_PARENTHESIZED_P on PAREN_EXPR. (maybe_undo_parenthesized_ref): Test PAREN_EXPR for REF_PARENTHESIZED_P. gcc/c-family/ChangeLog: * c-common.c (c_common_reswords): Add __builtin_assoc_barrier. * c-common.h (enum rid): Add RID_BUILTIN_ASSOC_BARRIER. gcc/c/ChangeLog: * c-decl.c (names_builtin_p): Handle RID_BUILTIN_ASSOC_BARRIER. * c-parser.c (c_parser_postfix_expression): Likewise. gcc/ChangeLog: * doc/extend.texi: Document __builtin_assoc_barrier.
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