* ui-out.c (do_list_end): New function.

* ui-out.c (do_list_end): New function.
(make_cleanup_ui_out_list_end): New function.
* ui-out.h: Provide prototype for make_cleanup_ui_out_list_end.
* stack.c (print_frame) [UI_OUT]: Call
make_cleanup_ui_out_list_end to make sure we mark the end of the
list if we do a non-local exit.  At the end of the function,
instead of calling ui_out_list_end directly, let do_cleanups
handle it.