dbr quant function fusion [1/x]: record matches for functions (#71764)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/71764
For DBR quant, adds the code for matching seen ops to function fusion
patterns. After we have the full DAG, we have a separate pass over the
dag and add matched fusion patterns to the seen op data structure.
This is the first PR in the stack which implements matching and
recording the match results. Future PRs in this stack will use
the match results to modify observer insertion and inference.
Test Plan:
```
python test/test_quantization.py TestQuantizeDBR.test_fusion_functions
```
Reviewed By: jerryzh168
Differential Revision: D33775098
Pulled By: vkuzo
fbshipit-source-id: 488aac902bf568d41c863ee49248990411ed9c53
(cherry picked from commit 4ad1ca1abc60af813805497573c097759184e293)
