Port gcd to structured (#57624)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/57624
Test Plan: Imported from OSS
Reviewed By: VitalyFedyunin
Differential Revision: D28224832
Pulled By: ezyang
fbshipit-source-id: 30a8eba025c67d990103e49c03a396810f9d4006
