gdb/

gdb/
	PR 11914
	* f-valprint.c (info_common_command): New variable frame_id.
	Reinitialize FI form FRAME_ID after each print_variable_and_value.
	* printcmd.c (print_variable_and_value): Extend function comment.
	Add comment for invalidated FRAME.
	* stack.c (backtrace_command_1): New variable frame_id.  Reinitialize
	FI form FRAME_ID after each print_frame_local_vars.
	(struct print_variable_and_value_data): Change frame to frame_id.
	(do_print_variable_and_value): New variable frame, initialize it from
	p->frame_id.  Add comment for invalidated FRAME.
	(print_frame_local_vars, print_frame_arg_vars): New function comment.
	Update CB_DATA.FRAME to CB_DATA.FRAME_ID initialization.  Add comment
	for invalidated FRAME.

gdb/testsuite/
	PR 11914
	* gdb.python/py-prettyprint.c (eval_func, eval_sub): New.
	(main): Call eval_sub.
	* gdb.python/py-prettyprint.exp:
	(python execfile ('py-prettyprint.py')): Move it earlier.
	New breakpoint for eval-break.
	(continue to breakpoint: eval-break, info locals): New test.
	(python execfile ('py-prettyprint.py')): Move it from here.
	* gdb.python/py-prettyprint.py (class pp_eval_type): New.
	(register_pretty_printers): Register pp_eval_type.