gdb/

gdb/
	Code reshuffle.
	* frame.h (struct frame_arg): New definition.
	(read_frame_arg): New declaration.
	* mi/mi-cmd-stack.c (list_arg_or_local): New functiom from ...
	(list_args_or_locals): ... the code here.  New variable arg, call
	read_frame_arg and list_arg_or_local with it.  Unify the
	PRINT_SIMPLE_VALUES and PRINT_ALL_VALUES cases.  Call xfree for
	arg.error.
	* stack.c (print_frame_arg): New functiom from the code of
	print_frame_args.
	(read_frame_arg): New function.
	(print_frame_args): Remove variable val.  New variable arg, call
	read_frame_arg and print_frame_arg with it.  Call xfree for arg.error.