psnr tool, work around for ios 64 bit compiler where int passed into assembly needs to be explicitely cast to 'w' register. BUG=437 TESTED=untested R=bcornell@google.com
psnr tool, work around for ios 64 bit compiler where int passed into assembly needs to be explicitely cast to 'w' register.
BUG=437
TESTED=untested
R=bcornell@google.com

Review URL: https://webrtc-codereview.appspot.com/53389004
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