Make aarch64 more like arm wrt strict-aliasing.

All thumb code compiles with -fno-strict-aliasing. Let's not make aarch64
porting any more difficult than it needs to be.

Change-Id: I94874df1217b69532c328d7c86c9961631ebde8a
Merge "Make aarch64 more like arm wrt strict-aliasing."
Merge branch 'master' of https://android.googlesource.com/platform/build into HEAD