(#22775)
Summary:
passing FusionCallback and Symbol to recursive GraphFuser calls. It ensures
consistent fusion in nested Blocks.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/22775
Differential Revision: D16439979
Pulled By: soumith
fbshipit-source-id: 18d4b13f52b03708b8580c73f75450adbb672ac1
