Don't unsafely clone autograd meta (#89720)
Addresses this CR comment https://github.com/pytorch/pytorch/pull/88817/files#r1024618045
This appears to fix Dynamo+DDP+hf_BERT test but I don't
know how to make a minimum reproducer.
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Pull Request resolved: https://github.com/pytorch/pytorch/pull/89720
Approved by: https://github.com/soumith, https://github.com/bdhirsh, https://github.com/malfet
