* ppc-tdep.h (struct gdbarch_tdep): Remove ppc_ev31_regnum member.

	* ppc-tdep.h (struct gdbarch_tdep): Remove ppc_ev31_regnum member.
	* rs6000-tdep.c (IS_SPE_PSEUDOREG): New macro.
	(spe_register_p, rs6000_register_name, rs6000_pseudo_register_type,
	rs6000_pseudo_register_reggroup_p, e500_move_ev_register,
	e500_pseudo_register_read, e500_pseudo_register_write): Use
	IS_SPE_PSEUDOREG macro.
	(rs6000_frame_cache): Remove use of tdep->ppc_ev31_regnum.
	(rs6000_gdbarch_init): Remove unnecessary num_sprs local variable.
	Remove initialization of tdep->ppc_ev31_regnum.