* config/mmix/mmix.h (REGISTER_MOVE_COST): Remove macro.
	* config/mmix/mmix-protos.h (mmix_register_move_cost): Remove.
	* config/mmix/mmix.c (mmix_register_move_cost): Make static.
	Change 'from' and 'to' arguments type to reg_class_t.
	(TARGET_REGISTER_MOVE_COST): Define.

From-SVN: r177600