[x265] [PATCH] pixel: cleared the bug in sse_sp4

[chen]

>-        T00 = _mm_unpacklo_epi16(T00, _mm_setzero_si128());
>+        __m128i sign = _mm_srai_epi16(T00, 15);
>+        T00 = _mm_unpacklo_epi16(T00, sign);
>         T01 = _mm_unpacklo_epi8(T01, _mm_setzero_si128());

I guess pmovsxwd is faster
 
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