* name-lookup.h (get_global_value_if_present): New function.
	(is_typename_at_global_scope): Likewise.
	* except.c (do_begin_catch): Use get_global_value_if_present.
	(do_end_catch): Likewise.
	(do_allocate_exception): Likewise.
	(do_free_exception): Likewise.
	(build_throw): Likewise.
	* parser.c (cp_parser_member_declaration): Likewise.
	* rtti.c (throw_bad_cast): Likewise.
	(throw_bad_typeid): Likewise.
	* decl.c (check_tag_decl): Use is_typename_at_global_scope.
	(grokdeclarator): Likewise.
	* cp-tree.h (global_namespace): Move to name-lookup.h
	* call.c (call_builtin_trap): Tidy.

From-SVN: r71858