Don't copy name_to_input in OutputGraph

[mlazos]

This copy isn't necessary and regressed tracing Adam by ~10s with a 1000 parameter model.

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[mlazos]

@pytorchbot merge -f "Unrelated test failure"

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[mlazos]

jolly good show, I was wondering about what this was used for lol

Yee, it's already managed properly in restore, so it doesn't need to be saved basically nodes that are removed during rollback will get removed from the map too.

This is also used for generating unique input names quickly when adding inputs