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fbarchard@google.com committed 9f4636e298e
AVX2 port of ScaleDownBy4. BUG=314 TESTED=out\release\libyuv_unittest --gtest_filter=*.ScaleDownBy4* Review URL: https://webrtc-codereview.appspot.com/46159004 git-svn-id: http://libyuv.googlecode.com/svn/trunk@1390 16f28f9a-4ce2-e073-06de-1de4eb20be90