gcc/c-family/
	* c-cppbuiltin.c (c_cpp_builtins): Define
	__cpp_nontype_template_args.
gcc/cp/
	* parser.c (cp_parser_template_argument): For C++1z just parse a
	constant-expression.
	* pt.c (convert_nontype_argument): For C++1z always call
	maybe_constant_value.

From-SVN: r229019