Revert "[inductor] Lower masked_scatter on CUDA (#108803)"
This reverts commit c8e577bf409591910f9667a51f2cf92b3c5455e0.
Reverted https://github.com/pytorch/pytorch/pull/108803 on behalf of https://github.com/lezcano due to makes test_comprehensive_masked_scatter_cuda_int64 flaky ([comment](https://github.com/pytorch/pytorch/pull/108803#issuecomment-1716407433))
