[FX] Track use nodes in Node (#45775)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/45775
Test Plan: Imported from OSS
Reviewed By: zdevito
Differential Revision: D24091082
Pulled By: jamesr66a
fbshipit-source-id: b09bb6ae78436a7722fb135b8ec71464ef9587cd
