[FFmpeg-devel] [PATCH] Fix Win64 AVX h264_deblock by not using redzone on Win64

[Matthew Wolenetz]

This patch fixes an issue encountered downstream in Chromium on Win64 on at
least AVX.  Win64, unlike other x64, does not allow usage of redzone in its
ABI.  h264_deblock.asm included indiscriminate usage of redzone on x86_64,
causing Access Violations on win64 chromium.

I attempted to repro the issue in win64 fate-h264 on ffmpeg HEAD, but none
of those tests appear to have failed.  After applying the patch, none of
the fate regression tests failed on win64.

Note: Thanks go to rbultje@ for providing the patch.

Matt
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