Array sizes of `array_of_gsizes`, `array_of_distribs`, `array_of_dargs`,
and `array_of_psizes` parameters of the `ompi_datatype_create_darray`
function (and `MPI_TYPE_CREATE_DARRAY`) are all `ndims`.
`ndims` are `i[2]`, not `i[0]`. See MPI-3.1 p.122.
Because this function `__ompi_datatype_create_from_args` is used by
pt2pt OSC, using a datatype created by `MPI_TYPE_CREATE_DARRAY` for
`MPI_(R)(GET_)ACCUMULATE` caused a segmentation fault or something
on a target process.
Signed-off-by: KAWASHIMA Takahiro <t-kawashima@jp.fujitsu.com>
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