Update clang-tools to ab/6661405 am: ec7e496bac am: 0db5d9d0f4 am: 75439a9e6b am: f032c5df83

Original change: https://android-review.googlesource.com/c/platform/prebuilts/clang-tools/+/1358042

Change-Id: Icb168f3a6c7432cce9a5fb35a60a4c7fb7f8b5db
tree: 84266b6517128349e2e8f4c9e30cbf70f479ad61
  1. darwin-x86/
  2. linux-x86/
  3. build-prebuilts.sh
  4. manifest.xml