Name inference rule for torch.cat (#25568)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/25568
Test Plan
- new test [namedtensor ci]
Test Plan: Imported from OSS
Differential Revision: D17159069
Pulled By: zou3519
fbshipit-source-id: fbc185ea5865b128508451096b742ac18e467670
