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replay: convert "mpi_comm" to actual MPI convertor

Utkarsh Ayachit requested to merge utkarsh.ayachit/catalyst:replay-mpi-fixes into master

Ensuring that catalyst_replay converts /mpi_comm and */mpi_comm in catalyst_initialize call to MPI_COMM_WORLD. Since catalyst implementations will often use those paths to obtain the communicator handle, this ensure catalyst_replay works as expected for those use-cases too.

Using these specific paths is a bit of a hack for now. It's unclear how can we support this more generically.

Fixes #3 (closed).

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