[x265] [PATCH] asm: pixelsub_ps routine for all block sizes

[chen]

>+movd        m0,    [r2]
>+pinsrw      m0,    [r2 + r4],    2
>+movd        m1,    [r2 + 2 * r4]
pinsrw is expensive instruction, it generate 2 uops
at here, the width is 2, so I suggest use general register future (movzx+sub)
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