[C++ PATCH] overloaded operator fns [5/N]

https://gcc.gnu.org/ml/gcc-patches/2017-10/
	* cp-tree.h (struct operator_name_info_t): Rename to ...
	(struct ovl_op_info_t): ... here.  Add tree_code field.
	(operator_name_info, assignment_operator_name_info): Delete.
	(ovl_op_info): Declare.
	(OVL_OP_INFO): Adjust.
	* decl.c (grok_op_properties): Use ovl_op_flags.
	* lex.c (operator_name_info, assignment_operator_name_info):
	Delete.
	(ovl_op_info): Define.
	(set_operator_ident): Adjust.
	(init_operators): Set tree_code.
	* mangle.c (write_unqualified_id): Adjust operator array scan.

From-SVN: r254279