Dynamo - config gated torch.distributed allow, exclusion for special leaf funcs (#110894)
`is_allowed` is a tricky bit of functionality - it sits early up in builder and is used to drive the creation of TorchVariable (more notes here, meta only https://fb.workplace.com/groups/pytorch.dev/permalink/1393563781222098/)
If we are tracing distributed in full, we want to route certain calls in distributed to NOT PASS is_allowed (this does not, confusingly, mean that they are not allowed, lol, but rather that we dont want them to become TorchVariable), others, we are fine with preserving.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/110894
Approved by: https://github.com/ezyang
