sh.c (calc_live_regs): If the return address pointer is live, force pr live.

sh.c (calc_live_regs): If the return address pointer is live, force pr live.

	* sh.c (calc_live_regs): If the return address pointer is live,
	force pr live.
	(sh5_schedule_saves): Exclude PR_MEDIA_REG from being a temp register
	for saves / restores.
	(sh_expand_epilogue): If sh_media_register_for_return returns a
	register number, flag the instructions that restores PR_MEDIA_REG
	as possibly dead.
	Remove dead update of offset.
	(sh_get_pr_initial_val): Use UNSPEC_RA if we don't know yet if
	we can use the result of get_hard_reg_initial_val.
	* sh.md (UNSPEC_RA): New constant.
	(movsi_i_lowpart+1): Changed into a define_insn_and_split, named:
	(load_ra).  Handle UNSPEC_RA.
	(sibcall_media): Use PR_MEDIA_REG.

From-SVN: r70234