lazily init AliasDb and add `changed` status to CSE (#54776)
Summary:
Fixes #{issue number}
Pull Request resolved: https://github.com/pytorch/pytorch/pull/54776
Reviewed By: H-Huang
Differential Revision: D27422064
Pulled By: Krovatkin
fbshipit-source-id: dfeb61001f60a2080246e128d8b7f83bbc584801
