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* scalar optimization, vectorization. * 0.5% AEC overall speedup for the straight C path. * 2.8% AEC overall speedup for the SSE2 path. Review URL: http://webrtc-codereview.appspot.com/48008 git-svn-id: http://webrtc.googlecode.com/svn/trunk@137 4adac7df-926f-26a2-2b94-8c16560cd09d