mmx.md (*mov<mode>_internal_rex64): Use if_then_else RTX to calculate unit, prefix_re...

mmx.md (*mov<mode>_internal_rex64): Use if_then_else RTX to calculate unit, prefix_rep and prefix_data16 attributes.

	* config/i386/mmx.md (*mov<mode>_internal_rex64): Use if_then_else RTX
	to calculate unit, prefix_rep and prefix_data16 attributes.
	(*mov<mode>_internal): Ditto for unit attribute.
	(*movv2sf_internal_rex64): Ditto for unit and prefix_rep attributes.
	(*movv2sf_internal): Ditto.
	* config/i386/sse.md (VI1248_256): Remove mode iterator.
	(avx2_eq<mode>3): Use VI_256 instead of VI1248_256.
	(*avx2_eq<mode>3): Ditto.
	(avx2_gt<mode>3): Ditto.

From-SVN: r178982