am 5488c8b2: Merge "Change dvmHeapBitmapXorWalk to dvmHeapBitmapSweepWalk."

Merge commit '5488c8b2a6f4254cdfa4abbb655784fb5d632008' into dalvik-dev

* commit '5488c8b2a6f4254cdfa4abbb655784fb5d632008':
  Change dvmHeapBitmapXorWalk to dvmHeapBitmapSweepWalk.