Make operator names consistent between export_opnames and the lite interpreter (#34674)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/34674
Two changes to make sure the op_names dumped in export_opnames() are consistent to what are actually used in bytecode.
* Inline graph before dumping the operator names.
* Use code of the graph (which is used in bytecode) instead of the nodes of graph.
Test Plan: Imported from OSS
Differential Revision: D20610715
Pulled By: iseeyuan
fbshipit-source-id: 53fa9c3b36f4f242b7f2b99b421f4adf20d4b1f6
