[x265] [PATCH Review only] asm: pixelsub_ps routine for 4xN blocks

[chen]

>+%macro PIXELSUB_PS_W4_H4 2
>+INIT_XMM sse4
>+cglobal pixel_sub_ps_%1x%2, 6, 7, 8, dest, deststride, src0, src1, srcstride0, srcstride1
>+
>+add    r1,     r1
>+mov    r6d,    %2
%2/4
 
>+    sub       r6d,              4
dec r6d
 
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