Revert "Fix jagged NT softmax semantics (#119459)"
This reverts commit 6adadbaf7943f760ea2375619b1783020b69d4e6.
Reverted https://github.com/pytorch/pytorch/pull/119459 on behalf of https://github.com/malfet due to broke dynamo, see https://github.com/pytorch/pytorch/actions/runs/7835402753/job/21386634602 ([comment](https://github.com/pytorch/pytorch/pull/119459#issuecomment-1935246413))
