[JIT] consider side effects when trying moves in alias analysis (#39497)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/39497
Previously, we didn't consider side effects at all when moving nodes in alias analysis. It is never valid to reorder a node with a side effect. This has led to bugs when used with Bailouts.
Unfortunately this will might cause regressions but it wasn't correct prior :/
Test Plan: Imported from OSS
Differential Revision: D21963774
Pulled By: eellison
fbshipit-source-id: 656995d1b82534eca65437ed4e397b2bf08a4dec
