Remove SH5 target regs.

Remove SH5 target regs.

gcc/
	* config/sh/constraints.md (b): Remove constraint.
	* config/sh/predicates.md (arith_reg_operand): Remove TARGET_REGISTER_P.
	* config/sh/sh-modes.def (PDI): Remove.
	* config/sh/sh.c (sh_target_reg_class,
	sh_optimize_target_register_callee_saved): Remove functions.
	(sh_option_override): Don't set MASK_SAVE_ALL_TARGET_REGS.
	(sh_expand_epilogue): Update comment.
	(sh_hard_regno_mode_ok, sh_register_move_cost, calc_live_regs,
	sh_secondary_reload): Remove TARGET_REGS related code.
	* config/sh/sh.h (FIRST_TARGET_REG, LAST_TARGET_REG,
	TARGET_REGISTER_P): Remove macros.
	(SH_DBX_REGISTER_NUMBER, REG_ALLOC_ORDER): Remove target regs.
	* config/sh/sh.md (PR_MEDIA_REG, T_MEDIA_REG, FR23_REG, TR0_REG,
	TR1_REG, TR2_REG): Remove constants.
	* config/sh/sh.opt (SAVE_ALL_TARGET_REGS): Remove.

From-SVN: r236928