This is a merge of the widevine CL: https://widevine-internal-review.googlesource.com/11254 On arm64, some devices are having random issues that probaby relate to a stale instruction cache. This code change flushes the cache for pages that are going to be made executable. b/17400000 Current Library Version: arm64: Level3 Library Sep 25 2014 17:10:03 Change-Id: I3904e96e922654c055a478079aa52c29cbde8b9f