From https://github.com/llvm/llvm-project
 * branch                      main       -> FETCH_HEAD
   bb51c5d4b85a..64fe3236476a  main       -> origin/main
Switched to branch 'main'
Your branch is behind 'origin/main' by 1 commit, and can be fast-forwarded.
  (use "git pull" to update your local branch)
HEAD is now at 64fe3236476a [llvm] Migrate away from ArrayRef(std::nullopt) (NFC) (#144967)