Add x + 0 optimization (#65574)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/65574
Test Plan: Imported from OSS
Reviewed By: navahgar
Differential Revision: D31732420
Pulled By: eellison
fbshipit-source-id: 0271e0dc0ddab06220048ed5bf4236fc85f3318c
