ns for fx: skip shadowing ops if copy subgraph is not implemented (#76663)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/76663
Subgraph copy does not handle all edge cases. It's high eng time
to handle them all, and currently an unhandled edge case crashes
the script.
This PR adds a function to check if the subgraph copy is supported,
and skips shadowing if it is not supported. This way the model
can still go through the shadowing APIs without an exception.
Test Plan:
```
python test/test_quantization.py -k FXNumericSuite
```
Reviewed By: hx89
Differential Revision: D36069304
Pulled By: vkuzo
fbshipit-source-id: 6b38b8d8e43396a4cf2373b247223a19d451d096
(cherry picked from commit e2322ca0635c51a4701e60fa90f77915a3c46d0f)
