avr-protos.h (avr_mode_code_base_reg_class): New prototype.

	* config/avr/avr-protos.h (avr_mode_code_base_reg_class): New prototype.
	(avr_regno_mode_code_ok_for_base_p): New prototype.
	* config/avr/avr.h (BASE_REG_CLASS): Remove.
	(REGNO_OK_FOR_BASE_P): Remove.
	(REG_OK_FOR_BASE_NOSTRICT_P): Remove.
	(REG_OK_FOR_BASE_STRICT_P): Remove.
	(MODE_CODE_BASE_REG_CLASS): New define.
	(REGNO_MODE_CODE_OK_FOR_BASE_P): New define.
	* config/avr/avr.c (avr_mode_code_base_reg_class): New function.
	(avr_regno_mode_code_ok_for_base_p): New function.
	(avr_reg_ok_for_addr_p): New static function.
	(avr_legitimate_address_p): Use it.  Beautify.

From-SVN: r179817