sse.md (*avx_cvtdq2pd256_2): Rename to...

	* config/i386/sse.md (*avx_cvtdq2pd256_2): Rename to...
	(avx_cvtdq2pd256_2): ... this.
	(sseunpackfltmode): New mode attr.
	(vec_unpacks_float_hi_v8hi, vec_unpacks_float_lo_v8hi,
	vec_unpacku_float_hi_v8hi, vec_unpacku_float_lo_v8hi): Macroize
	using VI2_AVX2 iterator.
	(vec_unpacku_float_hi_v8si, vec_unpacku_float_lo_v8si): New
	expanders.

From-SVN: r179960