Minor improvements to ONNXIFI transform (#17964)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/17964
1. Make the output of TensorFill outputs CONSTANT during shape inference
2. Add option to avoid adding BatchAdjust ops
3. Add option to avoid lowering subgraph that's smaller than a limit
Reviewed By: hyuen
Differential Revision: D14360903
fbshipit-source-id: b3c5966b44e7cd0d56428acd6cc97f529b36b171
