Port `log_softmax_backward_data` to structured kernel (#62372)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/62372
Test Plan: Imported from OSS
Reviewed By: saketh-are
Differential Revision: D30240242
Pulled By: SplitInfinity
fbshipit-source-id: 67d5e4b1543c2e43675e905ce18ca49c11e33748
