check pointer of last pixel and last pixel + 64 are in the same page.
BUG=none
TEST=none
Review URL: https://webrtc-codereview.appspot.com/387006

git-svn-id: http://libyuv.googlecode.com/svn/trunk@170 16f28f9a-4ce2-e073-06de-1de4eb20be90
7 files changed