ONNX export: propagate node metadata across passes (#45256)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/45255
Mostly straightforward. Only downside in this PR is the lack of more scalable way to check for all newly-created nodes in `callPySymbolicFunction`. The other options were:
* Create a scope within the node's scope and loop through all nodes that correspond to the scope. The code would still need to loop through all nodes.
* Add extra state to the graph (no good reason to do so).
* Add extra state to the ONNX exporter, since python calls go back to `g.op(...)` (no good reason to do so, also not very pythonic).
cc BowenBao neginraoof
Pull Request resolved: https://github.com/pytorch/pytorch/pull/45256
Reviewed By: malfet, houseroad
Differential Revision: D31744281
Pulled By: msaroufim
fbshipit-source-id: 1b63f6e7f02ed61b3a9b7ac3d0be0a3a203c8ff6
