From github.com:llvm/llvm-project
 * branch                      main       -> FETCH_HEAD
   1e8c7cfc490b..9543fc766d34  main       -> origin/main
Switched to branch 'main'
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  (use "git pull" to update your local branch)
HEAD is now at 9543fc766d34 [mlir][mpi] adding MPI_Allgather and lowering to LLVM (#176937)