[x265] [PATCH] asm: fix mbtree_propagate_cost asm failure, fixes crash in OpenBSD

[chen]

We may extend m_scratch to avoid write beyond bound bug, it give us more performance.



btw: I put check code in C model before, but when I merge patch to hg tree, I lost it.

At 2015-11-04 22:34:33,dnyaneshwar at multicorewareinc.com wrote:
># HG changeset patch
># User Dnyaneshwar G <dnyaneshwar at multicorewareinc.com>
># Date 1446645042 -19800
>#      Wed Nov 04 19:20:42 2015 +0530
># Node ID 25bada1bb5494fc12d62e87d1b7b788307dd963f
># Parent  c11dd97a8b999414c60dceef8620d3d9055cf4c1
>asm: fix mbtree_propagate_cost asm failure, fixes crash in OpenBSD
>
>The SSE2 asm code reads and write extra 4 bytes if loop counter is not multiple
>of 2 as SSE2 asm code process 2 int values in single iteration
>
>The AVX asm code reads and write extra 4,8 or 12 bytes if loop counter is not
>multiple of 4 as AVX asm code process 4 int values in single iteration
>
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