https://developer.apple.com/library/ios/documentation/General/Conceptual/CocoaTouch64BitGuide/Major64-BitChanges/Major64-BitChanges.html Fixes golang/go#16182 Change-Id: I312749e8a7113bf9231eb3896f801e450f46a410 Reviewed-on: https://go-review.googlesource.com/24792 Reviewed-by: Elias Naur <elias.naur@gmail.com>