PR c++/51925
	* class.c (add_method): Set OVL_USED for using-decls.
	* tree.c (ovl_scope): New.
	* cp-tree.h: Declare it.
	* parser.c (cp_parser_template_name): Use it.
	* semantics.c (baselink_for_fns): Likewise.
	* name-lookup.c (set_inherited_value_binding_p): Likewise.

From-SVN: r183438