add create_hvector
(support MPI_Type_create_hvector
)
#635
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https://www.mpich.org/static/docs/v3.3/www3/MPI_Type_create_hvector.html.
https://github.com/eschnett/MPItrampoline/blob/1b759d1f4255b507d2dbbd41a822a27558f5ba2d/mpiabi/mpi_functions.py#L355.