Update clang-tools to ab/6166214 am: f88257a0d9 am: 55374861cf

Change-Id: I9475e3409bf3620ed5414435f48f921b61e80f91
tree: 4bb315e8c427fe425107be78bfc154e6fdfbc6ba
  1. darwin-x86/
  2. linux-x86/
  3. build-prebuilts.sh
  4. manifest.xml