Remove 'Tensor' key from ATen codegen. (#17782)
Summary:
We used to have different ATen Tensor types, but we don't anymore. This was just being maintained by a codegen'ed comment.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/17782
Reviewed By: ezyang
Differential Revision: D14378004
Pulled By: gchanan
fbshipit-source-id: 1bbf276393a391252d372cc385230c784bd78588
