* call.c (add_list_candidates): Use OVL_FIRST.
	(build_new_method_call_1): Likewise.
	* cp-tree.h (OVL_SINGLE_P): New.
	(TYPE_HIDDEN_P): New.
	* decl.c (xref_tag_1): Use TYPE_HIDDEN_P.
	* dump.c (cp_tump_tree): Adjust overload dumping.
	* error.c (dump_decl): Use OVL_SINGLE_P, simplify context
	printing.
	* method.c (lazily_declare_fn): Assert we added it.
	* parser.c (cp_parser_nested_name_specifier): Use OVL_SINGLE_P,
	OVL_FIRST.
	(cp_parser_template_name): Use lkp_iterator.
	* pt.c (begin_template_parm_list): Fixup comment.
	(instantiate_class_template_1): Use TYPE_HIDDEN_P.
	* tree.c (ovl_iterator::remove_node): Cope with inherited ctors.
	(ovl_scope): Use lkp_iterator.

From-SVN: r248285