am b492c326: (-s ours) am 75233705: am a634c852: Reduce the frequency of bitmap walk loop-bound computations.

Merge commit 'b492c326009cc179ad9eb79857d0f7d23901860e' into dalvik-dev

* commit 'b492c326009cc179ad9eb79857d0f7d23901860e':
  Reduce the frequency of bitmap walk loop-bound computations.