gdb/

gdb/
	Code cleanup.
	* stack.c (struct print_stack_frame_args, print_stack_frame_stub):
	Remove, merge them into ...
	(print_stack_frame): ... here with a TRY_CATCH.  New variable e, remove
	variable args and its initialization.
	(struct print_args_args, print_args_stub): Remove, merge them into
	print_frame.
	(struct gdb_disassembly_stub_args, gdb_disassembly_stub): Remove, merge
	them into ...
	(do_gdb_disassembly): ... here.  Remove variable args and its
	initialization.
	(print_frame): Remove variable args and its initialization, new
	variable gdbarch and numargs (from print_args_stub), inline here
	print_args_stub with a TRY_CATCH.
	(struct backtrace_command_args, backtrace_command_stub): Remove, merge
	them into ...
	(backtrace_command, backtrace_full_command): ... here with a TRY_CATCH.
	New variable e, remove variable btargs and its initialization.