Remove refs from ArrayRef arguments (#31845)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/31845
ArrayRef is trivially copyable and should be passed by value. Removing
unnecessary `&`s.
Test Plan: Imported from OSS
Differential Revision: D19278523
Pulled By: suo
fbshipit-source-id: 026db693ea98d19246b02c48d49d1929ecb6478e
