pytorch

f98ab184 - [pytorch][codegen] move is_abstract property to NativeFunction model (#48252)

[pytorch][codegen] move is_abstract property to NativeFunction model (#48252) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/48252 Moved to a shared place so that gen_variable_type.py can reuse it. Test Plan: Imported from OSS Reviewed By: ezyang Differential Revision: D25087808 Pulled By: ljk53 fbshipit-source-id: 1f32e506956fc4eb08734cfde0add47b3e666bd9