[jit] Unify augmented assign handling (#33578)
Summary:
Stacked PRs
* **#33578 - [jit] Unify augmented assign handling**
* #32993 - [jit] Fix aug assign for non-tensor attributes
We handle augmented assignments to `Select` and `Var` statements differently, but the actual in place update is the same for both, so this PR factors it out into a method so we don't have 2 code paths doing the same thing.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/33578
Pulled By: driazati
Differential Revision: D20127647
fbshipit-source-id: 94f37acbd2551498de9d2ca09a514508266f7d31
