re PR c++/11493 (tree check ICE in error.c)

re PR c++/11493 (tree check ICE in error.c)

	* cp-tree.h (cp_id_kind): New type.
	(unqualified_name_lookup_error): Change prototype.
	(unqualified_fn_lookup_error): New function.
	(do_identifier): Remove.
	(do_scoped_id): Likewise.
	(tsubst_copy_and_build): Change prototype.
	(reregister_specialization): New function.
	(perform_koenig_lookup): Likewise.
	(finish_id_expression): Likewise.
	* call.c (build_method_call): Adjust call to
	unqualified_name_lookup_error.
	* decl.c (duplicate_decls): Use reregister_specialization.
	* lex.c (is_global): Remove.
	(unqualified_name_lookup_error): Return a value.
	(do_identifier): Remove.
	(do_scoped_id): Likewise.
	(identifier_typedecl_value): Remove.
	(unqualified_fn_lookup_error): New function.
	* parser.c (cp_parser_id_kind): Remove.
	(cp_parser_non_constant_id_expression): Remove.
	(cp_parser_primary_expression): Use finish_id_expression.
	(cp_parser_class_or_namespace_name): Use cp_id_kind, not
	cp_parser_id_kind.
	(cp_parser_postfix_expression): Use perform_koenig_lookup.
	(cp_parser_template_argument): Use cp_id_kind.
	(cp_parser_fold_non_dependent_expr): Adjust call to
	tsubst_copy_and_build.
	* pt.c (unregister_specialization): Rename to ...
	(reregister_specialization): This.
	(tsubst_friend_function): Use it.
	(maybe_fold_nontype_arg): Adjust call to tsubst_copy_and_build.
	(tsubst_qualified_id): Likewise.
	(tsubst_expr): Likewise.
	(tsubst_copy_and_build): Add function_p parameter.  Use
	finish_id_expression.  Introduce RECUR macro.
	(tsubst_non_call_postfix_expression): New function.
	(regenerate_decl_from_template): Use reregister_specialization.
	* semantics.c (perform_koenig_lookup): New function.
	(finish_id_expression): Likewise.

	PR c++/11493
	PR c++/11495
	* g++.dg/parse/template9.C: Likewise.
	* g++.dg/template/crash4.C: New test.
	* g++.dg/template/koenig1.C: Likewise.
	* g++.old-deja/g++.benjamin/tem03.C: Adjust error markers.
	* g++.old-deja/g++.benjamin/tem06.C: Declare "x".
	* g++.old-deja/g++.jason/overload33.C: Use this-> when calling
	functions.
	* g++.old-deja/g++.jason/template36.C: Likewise.
	* g++.old-deja/g++.mike/p1989.C: Likewise.
	* g++.old-deja/g++.pt/lookup2.C: Use -fpermissive when compiling.
	* g++.old-deja/g++.pt/ttp20.C: Use this->.
	* g++.old-deja/g++.pt/ttp21.C: Use this->.
	* g++.old-deja/g++.pt/typename13.C: Use -fpermissive when
	compiling.
	* g++.old-deja/g++.pt/union2.C: Use this->.

From-SVN: r69316