Fix get_arg to handle "self" (#20200)

[DrJessop]

Summary:

torch/fx/operator_schemas.py:112

In _torchscript_schema_to_signature_impl, self is renamed input. We need to copy this behavior in get_arg.

Reviewed By: ethansfng

Differential Revision: D108186918

[pytorch-bot]

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❌ 1 New Failure, 12 Pending

As of commit 6a1d897 with merge base fe9bc95 ():

NEW FAILURE - The following job has failed:

• pull / test-arm-backend-no-driver (test_pytest_ops_tosa) / linux-job (gh)
  RuntimeError: Command docker exec -t 99daf2b15506a79efac243d4510d382064cb2ac3d70ff65e63eab6e3db1aaf42 /exec failed with exit code 1

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[meta-codesync]

@DrJessop has exported this pull request. If you are a Meta employee, you can view the originating Diff in D108186918.

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