copy width to int64 to pass to assembly to avoid warning on ios 64 bit for implicit: value size does not match register size specified by the constraint and modif BUG=413 TESTED=local ios 64 bit build R=tpsiaki@google.com
copy width to int64 to pass to assembly to avoid warning on ios 64 bit for implicit: value size does not match register size specified by the constraint and modif
BUG=413
TESTED=local ios 64 bit build
R=tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/45749004

git-svn-id: a51711482b6ba0e1d1ab095578a045eeae45ac9a@1338 16f28f9a-4ce2-e073-06de-1de4eb20be90

rig-project/libyuv,rig-project/libyuv,rig-project/libyuv