[JIT] Re-land "Add aten::slice optimization" (#65341)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/65341
The changes in D30231044 (https://github.com/pytorch/pytorch/commit/babd4499783abc699faf36f3a72a9fc491e0e572) were removed due to a downstream issue in glow. Now that the issue has been fixed by D30849396, we can safely re-introduce the changes.
Test Plan:
`buck test //caffe2/test:jit -- TestPeephole`
Glow test:
* `buck test //glow/fb/torch_glow/tests:unfuse_glow_ops_test`
* qxy11 confirmed that the problematic glow model now loads correctly with these changes
Reviewed By: eellison
Differential Revision: D31056878
fbshipit-source-id: 049903ee04ba88885cc9d1a91427af0f1f44f681
