Unify async execution for JIT functions (#57852)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/57852
Another great example of the benefits of Futures. Thanks to the "right abstraction" (i.e., the `thenAsync` method), adding support for async execution becomes trivial, and the code much simpler than what it used to be.
ghstack-source-id: 129567063
Test Plan: CI
Reviewed By: mrshenli
Differential Revision: D28253842
fbshipit-source-id: b660151ca300f3d6078db0f3e380c80a4d8f5190
