gcc/cp/
	* cp-tree.h (LOOKUP_SEEN_P, LOOKUP_FOUND_P): New.
	* name-lookup.h (lookup_arg_dependent): Return plain tree.
	* name-lookup.c (arg_lookup, arg_assoc, arg_assoc_args)
	arg_assoc_args_vec, arg_assoc_type, add_function,
	arg_assoc_namespace, arg_assoc_class_only, arg_assoc_bases,
	arg_assoc_class, arg_assoc_template_arg, arg_assoc,
	lookup_arg_dependent_1): Delete.
	(name_lookup): New lookup object.
	(name_lookup::preserve_state, name_lookup::restore_state)
	name_lookup::mark_seen, name_lookup::find_and_mark,
	name_lookup::add_fns, name_lookup::adl_namespace_only,
	name_lookup::adl_namespace, name_lookup::adl_class_only,
	name_lookup::adl_bases, name_lookup::adl_class,
	name_lookup::adl_expr, name_lookup::adl_type,
	name_lookup::adl_template_arg, name_lookup::search_adl): New.
	(lookup_arg_dependent): Return a plain tree.  Adjust.
	(is_associated_namespace): Move later.
	gcc/cp/
	* g++.dg/lookup/koenig14.C: New.

From-SVN: r248457