[model loading] Skip ssaRewrite for predict_net if it has been ssaRewritten (#35428)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/35428
ATT
Reviewed By: yinghai
Differential Revision: D20655131
fbshipit-source-id: 4089b3527fc7b83ba793f8d292c7189a0fa68361
