mmx.md (*mov<mode>_internal_rex64): Use Yi instead of x to avoid inter-unit moves for !TARGET_INTER_UNIT_MOVES.

	* config/i386/mmx.md (*mov<mode>_internal_rex64): Use Yi instead of x
	to avoid inter-unit moves for !TARGET_INTER_UNIT_MOVES.
	(*movv2sf_internal_rex64): Ditto.

From-SVN: r138566