create API jit::Module::deepcopy(device) (#106521)
Summary:
Before we copy a meta merge, and use it as a skeleton to do d2d merge replication. However some models like prospector has CPU op LongIndex which takes quite long time to load. That makes the meta merge copy expensive.
Modify jit::Module::deepcopy() to allow device copy. It simplifies user code and removes all unnecessary copies like tempfile, meta merge
Pull Request resolved: https://github.com/pytorch/pytorch/pull/106521
Approved by: https://github.com/davidberard98
