Update clang-tools to ab/8211976 am: ec8c89d523 am: 91f4dc745f am: a7e96bd5fb

Original change: https://android-review.googlesource.com/c/platform/prebuilts/clang-tools/+/1997532

Change-Id: I6a2c0bc9b98174c5b4148599d1fe3018ab1d7850