[automerger skipped] Update clang-tools to ab/4809351 am: 186a9d1adf
am: 4aa582b4c1  -s ours

Change-Id: I3a817956c2bc7da965dbc7d4f3aa59c700929efe
tree: 7f1a2853cc94de56218c4401d7a5f547d959f167
  1. darwin-x86/
  2. linux-x86/
  3. build-prebuilts.sh
  4. manifest.xml