* config/mmix/mmix.h (PREFERRED_RELOAD_CLASS,
	PREFERRED_OUTPUT_RELOAD_CLASS): Remove macro.
	* config/mmix/mmix-protos.h (mmix_preferred_reload_class,
	mmix_preferred_output_reload_class): Remove.
	* config/mmix/mmix.c (mmix_preferred_reload_class,
	mmix_preferred_output_reload_class): Make static. Change rclass
	argument and return type to reg_class_t.
	(TARGET_PREFERRED_RELOAD_CLASS,
	TARGET_PREFERRED_OUTPUT_RELOAD_CLASS): Define.

From-SVN: r177069