https://gcc.gnu.org/ml/gcc-patches/2017-11/msg00018.html
	* cp-tree.h (IDENTIFIER_CP_INDEX): Define.
	(enum ovl_op_flags): Add OVL_OP_FLAG_AMBIARY.
	(enum ovl_op_code): New.
	(struct ovl_op_info): Add ovl_op_code field.
	(ovl_op_info): Size by OVL_OP_MAX.
	(ovl_op_mapping, ovl_op_alternate): Declare.
	(OVL_OP_INFO): Adjust for mapping array.
	(IDENTIFIER_OVL_OP_INFO): New.
	* decl.c (ambi_op_p, unary_op_p): Delete.
	(grok_op_properties): Use IDENTIFIER_OVL_OP_INFO and
	ovl_op_alternate.
	* lex.c (ovl_op_info): Adjust and static initialize.
	(ovl_op_mappings, ovl_op_alternate): Define.
	(init_operators): Iterate over ovl_op_info array and init mappings
	& alternate arrays.
	* mangle.c (write_unqualified_id): Use IDENTIFIER_OVL_OP_INFO.
	* operators.def (DEF_OPERATOR): Remove KIND parm.
	(DEF_SIMPLE_OPERATOR): Delete.
	(OPERATOR_TRANSITION): Expand if defined.

From-SVN: r254310