https://gcc.gnu.org/ml/gcc-patches/2017-11/msg00019.html
	gcc/cp/
	* cp-tree.h (assign_op_identifier, call_op_identifier): Use
	compressed code.
	(struct lang_decl_fn): Use compressed operator code.
	(DECL_OVERLOADED_OPERATOR_CODE): Replace with ...
	(DECL_OVERLOADED_OPERATOR_CODE_RAW): ... this.
	(DECL_OVERLOADED_OPERATOR_CODE_IS): Use it.
	* decl.c (duplicate_decls): Use DECL_OVERLOADED_OPERATOR_CODE_RAW.
	(build_library_fn): Likewise.
	(grok_op_properties): Likewise.
	* mangle.c (write_unqualified_name): Likewise.
	* method.c (implicitly_declare_fn): Likewise.
	* typeck.c (check_return_expr): Use DECL_OVERLOADED_OPERATOR_IS.

	libcc1/
	* libcp1plugin.cc (plugin_build_decl): Use
	DECL_OVERLOADED_OPERATOR_CODE_RAW.

From-SVN: r254314