Abstract SbqNode in preparation for adding a labeled variant #203
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tjgreen42
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This is a pure refactoring change to introduce a layer of abstraction around SBQ nodes so that we can introduce a labeled variant in a coming PR.
The basic idea is for
SbqNodeto become an enum wrapper class around the concrete implementations, currently justPlainSbqNode. SinceSbqNodehas a bunch of derived classes and traits, I had to introduce wrappers for those too, in addition to tweaking some abstractions. (It gets a little ugly, and I'm open to suggestions to find ways to simplify. I did experiment with an alternate approach, which was to add the SBQ node type as a parameter inSbqSpeedupStorage, but this turned out to be equally messy, due to the same plethora of derived traits and classes associated withSbqNode.)Test strategy: existing unit tests. No new functionality added.