am dc820701: Merge "liblog: optimize code hotspot"

* commit 'dc820701d5f85bb6f5325bbe846fb511f364ffbc':
  liblog: optimize code hotspot
tree: 6a47398102db4affe9f204f7c360b7bb5c466837
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/