[RFC] Somewhat BC breaking: make checkpoint_wrapper default to NO_REENTRANT (#108435)
We should use no_reentrant. There are a lot of users of this API, but
it is in a prototype state so should be fine to change.
Differential Revision: [D48898148](https://our.internmc.facebook.com/intern/diff/D48898148/)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/108435
Approved by: https://github.com/awgu
ghstack dependencies: #108032, #108033
