Fix: transactional translation validation insertion. (#107523)
This PR fixes transactional behavior of translation validation insertion.
Previously, this transactional behavior was implemented by removing the FX node if any
issues occurred until the end of `evaluate_expr`. However, since we cache FX nodes, we
might end up removing something that wasn't inserted in the same function call.
**Solution:** when creating an FX node for `call_function`, we also return whether this is
a fresh FX node or not. Then, we can appropriately handle each case.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/107523
Approved by: https://github.com/ezyang
