Walk Python AST to check for unsupported attribute type annotations (#51805)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/51805
Test Plan: Imported from OSS
Reviewed By: suo
Differential Revision: D26418589
Pulled By: ansley
fbshipit-source-id: c13e9096dcfa242d158ebf1ae4f86ef6c46ff0ec
