[x265] [PATCH Review only] asm: code for scale1D_128to64 routine

[chen]

>+;-----------------------------------------------------------------
>+; void scale1D_128to64(pixel *dst, pixel *src, intptr_t /*stride*/)
>+;-----------------------------------------------------------------
>+INIT_XMM sse2
>+cglobal scale_1D_128to64, 3, 3, 8, dest, src1, stride
>+
>+movu        m0,      [r1]
>+movu        m1,      [r1 + 1]
in this case, you don't need movu, below is better
palignr m1, m0, 1
 
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