Update clang-tools to ab/6450978 am: 8984d81cea am: 1c3632ca18 am: 87d0a502e3 am: 7882024a95 am: 067e15578b

Change-Id: I479d0ae4909d7dc52a465290d43e86e497f11dd5
tree: bcf6c4afcea8361d677531a3c57dbd3738feec6d
  1. darwin-x86/
  2. linux-x86/
  3. build-prebuilts.sh
  4. manifest.xml