From https://github.com/llvm/llvm-project
 * branch                      main       -> FETCH_HEAD
   7eec132f9c0d..70dce3d987ce  main       -> origin/main
Switched to branch 'main'
Your branch is behind 'origin/main' by 4 commits, and can be fast-forwarded.
  (use "git pull" to update your local branch)
HEAD is now at 70dce3d987ce [mlir] Migrate away from std::nullopt (NFC) (#145842)