work arounds for ios 64 bit compiler where int passed into assembly needs to be explicitely cast to 'w' register. BUG=437 TESTED=local ios build R=bcornell@google.com
work arounds for ios 64 bit compiler where int passed into assembly needs to be explicitely cast to 'w' register.
BUG=437
TESTED=local ios build
R=bcornell@google.com

Review URL: https://webrtc-codereview.appspot.com/49289004
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