Add a pattern-based fusion pass. (#19596)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/19596
ghimport-source-id: 1d7af5877dbeffa826201812649a9009c06c6305
Differential Revision: D15042033
Pulled By: ZolotukhinM
fbshipit-source-id: e3178d9aec2ac63fc3779ddedbd967aae0401c76
Author
Mikhail Zolotukhin
