sse.md (sseunpackmode): New mode attribute.

sse.md (sseunpackmode): New mode attribute.

	* config/i386/sse.md (sseunpackmode): New mode attribute.
	(ssepackmode): Ditto.
	(vec_pack_trunc_<mode>): Macroize expander from
	vec_pack_trunc_{v8hi,v4si,v2di} using VI248_128 mode iterator.
	(vec_unpacks_lo_<mode>): Macroize expander from
	vec_unpacks_lo_{v16qi,v8hi,v4si} using VI124_128 mode iterator.
	(vec_unpacks_hi_<mode>): Macroize expander from
	vec_unpacks_hi_{v16qi,v8hi,v4si} using VI124_128 mode iterator.
	(vec_unpacku_lo_<mode>): Macroize expander from
	vec_unpacku_lo_{v16qi,v8hi,v4si} using VI124_128 mode iterator.
	(vec_unpacku_hi_<mode>): Macroize expander from
	vec_unpacks_hi_{v16qi,v8hi,v4si} using VI124_128 mode iterator.
	* config/i386/i386.c (ix86_expand_sse_unpack): Merge with
	ix86_expand_sse4_unpack.
	* config/i386/i386-protos.h (ix86_expand_sse4_unpack): Remove.

From-SVN: r172585