llvm-project

9543fc76 - [mlir][mpi] adding MPI_Allgather and lowering to LLVM (#176937)

[mlir][mpi] adding MPI_Allgather and lowering to LLVM (#176937) - Adding MPI_Allgather to MPI dialect - Adding lowering to MPIToLLVM - Also lowering MPI_Commsize (see also #140392)