Repository: pytorch
Issue: [fx] make_fx with tracing_mode="real" errors with 'PythonKeyTracer' object has no attribute 'graph'
Labels: triaged,module: fx,oncall: pt2,module: ProxyTensor,module: pt2-dispatcher

### 🐛 Describe the bug

```python
import torch
from torch.fx.experimental.proxy_tensor import make_fx

def foo(x):
    return x + 1

g = make_fx(foo)(torch.randn(3,))
```

Error
```python
Traceback (most recent call last):
  File "/usr/local/lib/python3.12/dist-packages/torch/fx/experimental/proxy_tensor.py", line 2060, in _trace_inner
    t = dispatch_trace(
        ^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/dist-packages/torch/_compile.py", line 27, in inner
    import torch._dynamo
  File "/usr/local/lib/python3.12/dist-packages/torch/_dynamo/__init__.py", line 3, in <module>
    from . import convert_frame, eval_frame, resume_execution
  File "/usr/local/lib/python3.12/dist-packages/torch/_dynamo/convert_frame.py", line 55, in <module>
    from . import config, exc, trace_rules
  File "/usr/local/lib/python3.12/dist-packages/torch/_dynamo/trace_rules.py", line 46, in <module>
    from .variables import (
  File "/usr/local/lib/python3.12/dist-packages/torch/_dynamo/variables/__init__.py", line 108, in <module>
    from .torch import TorchCtxManagerClassVariable, TorchInGraphFunctionVariable
  File "/usr/local/lib/python3.12/dist-packages/torch/_dynamo/variables/torch.py", line 19, in <module>
    from ..codegen import PyCodegen
  File "/usr/local/lib/python3.12/dist-packages/torch/_dynamo/codegen.py", line 34, in <module>
    from .variables.torch_function import TensorWithTFOverrideVariable
  File "/usr/local/lib/python3.12/dist-packages/torch/_dynamo/variables/torch_function.py", line 185, in <module>
    populate_builtin_to_tensor_fn_map()
  File "/usr/local/lib/python3.12/dist-packages/torch/_dynamo/variables/torch_function.py", line 146, in populate_builtin_to_tensor_fn_map
    inp0 = torch.ones(1)
           ^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/dist-packages/torch/fx/experimental/proxy_tensor.py", line 1240, in __torch_function__
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/dist-packages/torch/utils/_stats.py", line 21, in wrapper
    return fn(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/dist-packages/torch/fx/experimental/proxy_tensor.py", line 1333, in __torch_dispatch__
    return proxy_call(self, func, self.pre_dispatch, args, kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/dist-packages/torch/fx/experimental/proxy_tensor.py", line 907, in proxy_call
    name=proxy_mode.tracer.graph._target_to_str(func.overloadpacket.__name__),
         ^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'PythonKeyTracer' object has no attribute 'graph'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/opt/pytorch/lightning-thunder/test.py", line 9, in <module>
    g = make_fx(foo)(torch.randn(3,))
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/dist-packages/torch/fx/experimental/proxy_tensor.py", line 2151, in wrapped
    return make_fx_tracer.trace(f, *args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/dist-packages/torch/fx/experimental/proxy_tensor.py", line 2089, in trace
    return self._trace_inner(f, *args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/dist-packages/torch/fx/experimental/proxy_tensor.py", line 2066, in _trace_inner
    trace_structured(
  File "/usr/local/lib/python3.12/dist-packages/torch/_logging/_internal.py", line 1179, in trace_structured
    payload = payload_fn()
              ^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/dist-packages/torch/fx/experimental/proxy_tensor.py", line 2072, in <lambda>
    payload_fn=lambda: self.fx_tracer.graph.python_code(  # type: ignore[union-attr]
                       ^^^^^^^^^^^^^^^^^^^^
AttributeError: 'PythonKeyTracer' object has no attribute 'graph'
```

### Versions

main f4158558aa5cfe504639ee9f7f73acf1d002f273

cc @ezyang @SherlockNoMad @EikanWang @jgong5 @wenzhe-nrv @chauhang @penguinwu @zou3519 @bdhirsh @yf225