Check that the upper bits are correct in the SkArenaAlloc footer.

TBR=mtklein@google.com

Change-Id: I8dc21778d1b8b24dd9d7b6919bb7e2bcfe090e82
Reviewed-on: https://skia-review.googlesource.com/7588
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Herb Derby <herb@google.com>
1 file changed