ModuleList concatenation (#70887)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/70441.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/70887
Reviewed By: ejguan
Differential Revision: D33555431
Pulled By: albanD
fbshipit-source-id: ce42459ee46a611e98e89f02686acbac16b6b668
