Update clang-tools to ab/6889351 am: 0fc590bad1 am: 3344916137 am: a132346f9a

Original change: https://android-review.googlesource.com/c/platform/prebuilts/clang-tools/+/1452695

Change-Id: Idae3c6faaf0f7a73335720631ecf2383c0ae78b2
tree: ea1febfb8d854433722f86a13f23feabd8074677
  1. darwin-x86/
  2. linux-x86/
  3. build-prebuilts.sh
  4. manifest.xml