Skip dispatch for is_signed (#53847)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/53847
Test Plan: Imported from OSS
Reviewed By: anjali411
Differential Revision: D26994937
Pulled By: carolineechen
fbshipit-source-id: 8af25ecdade0b31d29fac27de6ee5f704353af10
