[jit][static] Replace deepcopy with copy (#43182)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/43182
We should avoid using `deepcopy` on the module because it involves copying the weights.
Comparing the implementation of `c10::ivalue::Object::copy()` vs `c10::ivalue::Object::deepcopy()`, the only difference is `deepcopy` copies the attributes (slots) while `copy` does not.
Reviewed By: bwasti
Differential Revision: D23171770
fbshipit-source-id: 3cd711c6a2a19ea31d1ac1ab2703a0248b5a4ef3
