llvm-project

49f080af - [mlir][mpi] Mandatory Communicator (#133280)

[mlir][mpi] Mandatory Communicator (#133280) This is replacing #125361 - communicator is mandatory - new mpi.comm_world - new mp.comm_split - lowering and test --------- Co-authored-by: Sergio Sánchez Ramírez <sergio.sanchez.ramirez+git@bsc.es>