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83ba8c9bf5
This fixes the major performance problem with type tracking on some (pathological) databases. The interface could probably be improved a bit. In particular, I'm thinking that we might want to have `DataFlow::exprNode` return a `LocalSourceNode` so that a cast isn't necessary in order to use `flowsTo`. I have added two `cached` annotations. The one on `flowsTo` is crucial, as performance regresses without it. The one on `simpleLocalFlowStep` may not be needed, but Java has a similar annotation, and to me it makes sense to have this relation cached.