Short circuit device property access on FakeTensor (#93946)
Before:
```
(/home/ezyang/local/a/pytorch-env) [ezyang@devgpu020.ftw1 ~/local/a/pytorch (ab0e3db0)]$ python benchmarks/dynamo/timm_models.py --accuracy --timing --backend aot_eager --dynamic-shapes --float32 --only hrnet_w18
cuda eval hrnet_w18 PASS
TIMING: entire_frame_compile:54.19504 backend_compile:33.86702
STATS: call_* op count: 1369 | FakeTensor.__torch_dispatch__:72549 | FakeTensorMode.__torch_dispatch__:115542 | ProxyTorchDispatchMode.__torch_dispatch__:3103
```
After
```
(/home/ezyang/local/a/pytorch-env) [ezyang@devgpu020.ftw1 ~/local/a/pytorch (ab0e3db0)]$ python benchmarks/dynamo/timm_models.py --accuracy --timing --backend aot_eager --dynamic-shapes --float32 --only hrnet_w18
cuda eval hrnet_w18 PASS
TIMING: entire_frame_compile:53.97591 backend_compile:33.60832
STATS: call_* op count: 1369 | FakeTensor.__torch_dispatch__:4995 | FakeTensorMode.__torch_dispatch__:89985 | ProxyTorchDispatchMode.__torch_dispatch__:3010
```
It doesn't really help end-to-end wall time all that much, but it does cut the number of calls to FakeTensor.__torch_dispatch__ by an order of magnitude, which hopefully has other positive effects.
Signed-off-by: Edward Z. Yang <ezyang@meta.com>
Pull Request resolved: https://github.com/pytorch/pytorch/pull/93946
Approved by: https://github.com/eellison, https://github.com/albanD
