vchoi_fork

[svn-r5412] Purpose:
    Bug fix

Description:
    Calling MPI_Get_count needs to be done with the same MPI type as was used
    for the transfer and we are always using MPI_BYTE, even when a different
    MPI type was used for the transfer.

Solution:
    Only query MPI_Get_count with MPI_BYTE when we really used MPI_BYTE for the
    transfer.  Wait for later to query MPI_Get_count with other MPI types.

Platforms tested:
    IRIX64 6.5 (modi4)