BUG=239
TEST=LIBYUV_WIDTH=10000 out\release\libyuv_unittest
R=changjun.yang@intel.com, johannkoenig@google.com

Review URL: https://webrtc-codereview.appspot.com/1586006

git-svn-id: http://libyuv.googlecode.com/svn/trunk@712 16f28f9a-4ce2-e073-06de-1de4eb20be90