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remove broken MPI_TYPE_MIX_LB_UB #11

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@BenWibking BenWibking commented Feb 13, 2023

The code for setting the values of this datatype makes out of bounds writes using nonsensical array offsets, causing heap corruption and an immediate crash of the test suite process. This change removes all of the broken code associated with this datatype.

Fixes #8.

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heap corruption caused by tst_type_setvalue for MPI_TYPE_MIX_LB_UB
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