* m68hc11-tdep.c (struct m68hc11_unwind_cache): New struct to hold

	* m68hc11-tdep.c (struct m68hc11_unwind_cache): New struct to hold
	frame unwind information.
	(m68hc11_scan_prologue): New function from m68hc11_guess_from_prologue
	and adapted for frame unwinding.
	(m68hc11_skip_prologue): Update to scan prologue in temporary object.
	(m68hc11_unwind_pc): New function.
	(m68hc11_frame_unwind_cache): New function to analyze frames.
	(m68hc11_frame_this_id): New function to create new frame struct.
	(m68hc11_frame_prev_register): New function to unwind a register from
	the frame.
	(m68hc11_frame_unwind): Default 68hc11/68hc12 unwinder.
	(m68hc11_frame_p): New function for the above.
	(m68hc11_frame_base_address): New function to return fp of frame.
	(m68hc11_frame_args_address): Update for frame.
	(m68hc11_frame_base): Default 68hc11/68hc12 frame.
	(m68hc11_unwind_sp): New function.
	(m68hc11_unwind_dummy_id): New function.
	(m68hc11_gdbarch_init): Install the above frames; remove deprecated
	calls.