[MPS] Exclude int64 dtype from reduction ops (#91272)
Reduction ops don't support int64 data type. This PR takes care to assert when int64 is used for min / max reductions ops.
All other integer dtypes are casted to int32.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/91272
Approved by: https://github.com/razarmehr, https://github.com/malfet
