[dynamo] Hide guard_fail_hook behind a flag to improve cache lookup time (+10% DebertaV2) (#100590)
For TorchDynamo eager backend, DebertaV2 speedup improves from 0.77x to 0.87x.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/100590
Approved by: https://github.com/voznesenskym, https://github.com/wconstab
