[dynamo] Unblock a model with jit.isinstance (#109178)
prevents this error
```
File "/tmp/jetter.azp5q59y/torch/fx/proxy.py", line 291, in create_arg
python/0 raise NotImplementedError(f"argument of type: {type(a)}")
python/0 torch._dynamo.exc.InternalTorchDynamoError: argument of type: <class 'typing._GenericAlias'>
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/109178
Approved by: https://github.com/yanboliang
