Update clang-tools to ab/6242892 am: bc8274da91 am: 58d9f7e35d

Change-Id: I24754c6cee4b86be1d77469b0c611c40ff16922d
tree: 40e75dd4a241cbcf09457333343e338e73c96f2a
  1. darwin-x86/
  2. linux-x86/
  3. build-prebuilts.sh
  4. manifest.xml