Update clang-tools to ab/4691034 am: e9fb581425
am: 3b1cd28a61

Change-Id: I1f0f2b01ce1fb7418fa477e7848cf88457c75135
tree: 247a53eaec5e55946560e2a625389eeb7ce598c7
  1. darwin-x86/
  2. linux-x86/
  3. build-prebuilts.sh
  4. manifest.xml