Made CrossCorrelationTest valid in ARM-Neon platforms, with changes in signal_processing_unittest.cc. Review URL: https://webrtc-codereview.appspot.com/828006 git-svn-id: http://webrtc.googlecode.com/svn/trunk/src@2868 4adac7df-926f-26a2-2b94-8c16560cd09d