pytorch

6831d8e3 - Support Union in TorchScript (#64234)

Support Union in TorchScript (#64234) Summary: This PR is created to replace https://github.com/pytorch/pytorch/pull/53180 PR stack, which has all the review discussions. Reason for needing a replacement is due to a messy Sandcastle issue. Pull Request resolved: https://github.com/pytorch/pytorch/pull/64234 Reviewed By: gmagogsfm Differential Revision: D30656444 Pulled By: ansley fbshipit-source-id: 77536c8bcc88162e2c72636026ca3c16891d669a