* stabs.c (struct bincl_file): Add next_stack field.

	* stabs.c (struct bincl_file): Add next_stack field.
	(push_bincl): Put the new file on both bincl_list and
	bincl_stack.  Clear the file_types field.
	(pop_bincl): Use the next_stack field when popping the stack.
	Don't put the file on bincl_list.
	(find_excl): Include the file name when warning about an unfound
	N_EXCL.

	* debug.c (debug_type_samep): Don't crash if we are passed NULL.
PR 11465.