fix view listing in autograd codegen (#32044)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/32044
Fix the list of views in the codegen:
- Move `narrow` out of the autograd functions since it's now implemented with slice.
- Add `split_with_sizes` that was missing from the list
- Remove special formulas for both `split` and `split_with_sizes`. Both used not to be considered as views. When they are, all the rnn code breaks because it uses them in an invalid way. The generic formula will generate one `narrow` Node for each output. Which is always valid.
The diff for the generated code can be found [here](https://github.com/pytorch/pytorch/compare/16eff6e...albanD:06d6e85) (outdated for last commit)
Test Plan: Imported from OSS
Differential Revision: D19409648
Pulled By: albanD
fbshipit-source-id: 5ebc4c978af500403f7f008c0231b7db0cabab26
