[codegen] using TORCH_LIBRARY_FRAGMENT for some namespaces (#88229)
Summary:
Sometimes we want to extend an existing custom namespace library, instead of creating a new one,
but we don't have a namespace config right now, so we hardcode some custom libraries defined
in pytorch today, i.e. quantized and quantized_decomposed
Test Plan:
ci
Reviewers:
Subscribers:
Tasks:
Tags:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/88229
Approved by: https://github.com/ezyang
