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

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

Change-Id: I0d4d2c5fad357f4c2014be3442956a3931714349
tree: ea1febfb8d854433722f86a13f23feabd8074677
  1. darwin-x86/
  2. linux-x86/
  3. build-prebuilts.sh
  4. manifest.xml