* sh-tdep.h (struct gdbarch_tdep): Remove. Change all register

	* sh-tdep.h (struct gdbarch_tdep): Remove.  Change all register
	numbers to enumeration values.
	* sh-tdep.c: Accomodate above change.
	(SH_NUM_REGS): Rename from SH_DEFAULT_NUM_REGS.
	(NUM_PSEUDO_REGS_SH_MEDIA): Remove (sh5 only).
	(NUM_PSEUDO_REGS_SH_COMPACT): Remove (sh5 only).
	(IS_ADD_IMM_SP): Rename from IS_ADD_SP.
	(IS_FPUSH): Rename from IS_FMOV.
	(sh_extract_struct_value_address): Remove useless comment.
	(sh_dsp_register_sim_regno): Use register values from sh-tdep.h
	instead of own local values.
	(sh_dump_tdep): Remove.
	(_initialize_sh_tdep): Accomodate removing sh_dump_tdep.
	* sh3-rom.c (sh3_supply_register): Accomodate sh-tdep.h changes.