Use local_specializations to find capture proxies.

Use local_specializations to find capture proxies.

	* cp-tree.h (DECL_CAPTURED_VARIABLE): New.
	* lambda.c (build_capture_proxy): Set it.
	(add_capture): Pass initializer to build_capture_proxy.
	(start_lambda_function): Likewise.
	(insert_capture_proxy): Use register_local_specialization.
	(is_lambda_ignored_entity): Always ignore proxies.
	* name-lookup.c (qualify_lookup): Don't check
	is_lambda_ignored_entity if LOOKUP_HIDDEN is set.
	* semantics.c (process_outer_var_ref): Use
	retrieve_local_specialization.
	* parser.c (cp_parser_lambda_body): Push local_specializations.
	* pt.c (tsubst_expr): Pass LOOKUP_HIDDEN when looking for a proxy.
	(tsubst_lambda_expr): Push local_specializations sooner.
	(tsubst_copy_and_build): Don't register_local_specialization.

From-SVN: r253265