Move deprecation warning out of generated code into python_arg_parser. (#32907)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/32907
All op-specific information used in this logic was available to the
parser itself, so the check can be done in that context, no codegen
needed.
No change in the warning behavior itself, mod minor formatting tweak -
passes existing tests. Saves like ~275K binary size on mac:
```
-rwxr-xr-x 1 bhosmer 1876110778 16502064 Feb 1 00:43 torch/lib/libtorch_python.dylib
-rwxr-xr-x 1 bhosmer 1876110778 16247888 Feb 1 00:44 torch/lib/libtorch_python.dylib
```
[codegen diff](https://github.com/bhosmer/scratch/compare/deprecation_warning_before...deprecation_warning_after)
More important than the size savings is the minimization of codegen. Ideally the generated artifact should express distinctive per-op properties in as minimal a form as practically possible - e.g. here instead of generating check-and-warn behavior into every binding, we generate only the data that triggers the behavior in the parser. (And actually we were generating it already.)
Test Plan: Imported from OSS
Differential Revision: D19679928
Pulled By: bhosmer
fbshipit-source-id: cf0140573118430720c6b797c762fe5be98acd86
