Updating ONNX checker logic. (#33522)
Summary:
We want to run ONNX checker only when selected operator type is ONNX, and nowhere else. This PR updates the logic in the exporter.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/33522
Reviewed By: hl475
Differential Revision: D19983954
Pulled By: houseroad
fbshipit-source-id: 15db726321637a96fa110051cc54e9833e201133
