[FX] Support ellipsis as arg (#51502)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/51502
Test Plan: Imported from OSS
Reviewed By: ansley
Differential Revision: D26186578
Pulled By: jamesr66a
fbshipit-source-id: 91943af38412bafc1766398dfaebdf50b64ccd74
