Some miscellaneous cleanup in codegen (#46940)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/46940
- Remove inaccurate generated comments
- Delete some dead code
- Delete some unused headers
- Delete unnecessary SparseTypeDerived.cpp template
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Test Plan: Imported from OSS
Reviewed By: albanD
Differential Revision: D24573971
Pulled By: ezyang
fbshipit-source-id: 3de05d9cd9bada4c73f01d6cfaf51f16ada66013
