Port logaddexp and logaddexp2 to structured (#57629)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/57629
Test Plan: Imported from OSS
Reviewed By: VitalyFedyunin
Differential Revision: D28224830
Pulled By: ezyang
fbshipit-source-id: 356aa5683f254e77e0a77d76f6ef939631a3910c
