Update the benchmarking script to clone an eager model (#113046)
Summary:
fix https://github.com/pytorch/pytorch/issues/113029 where running a model in eager somehow can change a weight stride
X-link: https://github.com/pytorch/pytorch/pull/113046
Approved by: https://github.com/angelayi
Reviewed By: PaliC
Differential Revision: D51139962
Pulled By: desertfire
fbshipit-source-id: 3ae8a878cd408c9e20e1b5846f0086b540ff17e4