All cpu flags to be set so that instead of comparing C code, compare assembler to assembler, for benchmarking purposes.
BUG=none
TESTED=libyuv_unittest.exe
R=bcornell@google.com

Review URL: https://webrtc-codereview.appspot.com/50499004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1346 16f28f9a-4ce2-e073-06de-1de4eb20be90