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fbarchard@google.com committed a007046105b
scale columns ported to SSSE3 BUG=208 TESTED=runyuv Scale*640* Review URL: https://webrtc-codereview.appspot.com/1292004 git-svn-id: http://libyuv.googlecode.com/svn/trunk@647 16f28f9a-4ce2-e073-06de-1de4eb20be90