Update clang-tools to ab/4612694 am: 2bab765959 am: 298dbcbce9
am: 1f86bd46c9

Change-Id: Idc8efb4777fd986d2ec766dfcd56b4125272edf7
tree: caca163d9cc57a570186cfa9ce52f13014c02de2
  1. darwin-x86/
  2. linux-x86/
  3. build-prebuilts.sh
  4. manifest.xml