[x265] [PATCH Review only] asm: chroma_vpp[4x4] for color space i420 in avx2: improve 228c->186c

[chen]

In my PC, it is same speed to old SSE4 version.
Here is my demo for new algorithm, just improve 4 cycles, for you reference.

At 2014-11-27 19:24:04,"Divya Manivannan" <divya at multicorewareinc.com> wrote:
># HG changeset patch
># User Divya Manivannan <divya at multicorewareinc.com>
># Date 1417087358 -19800
>#      Thu Nov 27 16:52:38 2014 +0530
># Node ID 887d458dbe264afd5e8904c607c27a17309dc2e7
># Parent  973662a5e779d1760af93fc713606bc923155ec6
>asm: chroma_vpp[4x4] for color space i420 in avx2: improve 228c->186c
>
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