c-common.c (c_common_reswords): Add __is_literal_type.

c-common.c (c_common_reswords): Add __is_literal_type.

gcc/c-family/
	* c-common.c (c_common_reswords): Add __is_literal_type.
	* c-common.h (enum rid): Add RID_IS_LITERAL_TYPE.
gcc/cp/
	* cp-tree.h (cp_trait_kind): Add CPTK_IS_LITERAL_TYPE.
	* cxx-pretty-print.c (pp_cxx_trait_expression): Handle it.
	* semantics.c (trait_expr_value, finish_trait_expr): Likewise.
	* parser.c (cp_parser_primary_expression): Handle RID_IS_LITERAL_TYPE.
	(cp_parser_trait_expr): Likewise.
libstdc++-v3/
	* include/std/type_traits (is_literal_type): New.

From-SVN: r166020