SubgraphMatcher: add logging.
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/25074
Test Plan: Imported from OSS
Differential Revision: D16978654
Pulled By: ZolotukhinM
fbshipit-source-id: a59c86c11ea6a6e0acc09d0b1d73fa22e8d1451b
Author
Mikhail Zolotukhin
