am f885d876: Merge change I2bdc7ec9 into eclair

Merge commit 'f885d876a273bc76b0f5a35c9ea2346f4a5b4d59' into eclair-plus-aosp

* commit 'f885d876a273bc76b0f5a35c9ea2346f4a5b4d59':
  Speed up warn.py about 30x by precompiling all the regular expressions.