* alpha-mdebug-tdep.c: Include "trad-frame.h".

	* alpha-mdebug-tdep.c: Include "trad-frame.h".
	(struct alpha_mdebug_unwind_cache): Change type of SAVED_REGS to
	struct trad_frame_saved_reg *.
	(alpha_mdebug_frame_unwind_cache): Allocate SAVED_REGS using
	trad_frame_alloc_saved_regs.  Update accesses.  Record previous
	value of SP as being vfp.
	(alpha_mdebug_frame_prev_register): Use trad_frame_get_prev_register.
	* Makefile.in (alpha-mdebug-tdep.o): Update dependencies.