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For whatever reason, the CFG node for exceptions and exception groups was placed with the points-to code. (Probably because a lot of the predicates depended on points-to.) However, as it turned out, two of the SSA modules only depended on non-points-to properties of these nodes, and so it was fairly straightforward to remove the imports of `LegacyPointsTo` for those modules. In the process, I moved the aforementioned CFG node types into `Flow.qll`, and changed the classes in the `Exceptions` module to the `...WithPointsTo` form that we introduced elsewhere.