BUG=289
TESTED=drmemory on YUY2ToI420_Opt with odd width
R=tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/4709004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@881 16f28f9a-4ce2-e073-06de-1de4eb20be90