MergeUV aligned and SplitUV cpu detect combined with width check.
BUG=none
TEST=libyuvTest.I420ToNV12_Any
Review URL: https://webrtc-codereview.appspot.com/937005

git-svn-id: http://libyuv.googlecode.com/svn/trunk@451 16f28f9a-4ce2-e073-06de-1de4eb20be90
9 files changed