pytorch

09f2c6a9 - Back out "Revert D23494065: Refactor CallbackManager as a friend class of RecordFunction." (#44699)

Back out "Revert D23494065: Refactor CallbackManager as a friend class of RecordFunction." (#44699) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/44699 Original commit changeset: 3b1ec928e3db Previous revert (D23698861) was on the wrong diff stack. Backing out the revert. Test Plan: Passed unit tests and previously landed. Reviewed By: mruberry Differential Revision: D23702258 fbshipit-source-id: 5c3e197bca412f454db5a7e86251ec85faf621c1