Single source of truth for guard logging (#107532)
Instead of (poorly) reconstructing the guard list from the guards on OutputGraph, we log them at the horses mouth: when we actually codegen the guard. This only requires very modest refactoring: as we translate guards into code parts, we also have to pass the source guard along so we can use it to give stack information.
Signed-off-by: Edward Z. Yang <ezyang@meta.com>
Pull Request resolved: https://github.com/pytorch/pytorch/pull/107532
Approved by: https://github.com/anijain2305
ghstack dependencies: #107505, #107516, #107530
