Update clang-tools to ab/6339306 am: 881a528030 am: beac094e48

Change-Id: Ia25da48980a2dc35caae0d72bc2a120fb1325f1b
tree: a8aff0a81539d1d71c161f5e4fafd6daf08aa206
  1. darwin-x86/
  2. linux-x86/
  3. build-prebuilts.sh
  4. manifest.xml