C++: Remove unnecessary FlowState from cpp/overrun-write
#14486
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This flow state was necessary to have a
PathNodefor every place where pointer arithmetic was performed (because a state change always breaks up the big-step relation). However, in #13717 a change was made so that every additional flow step by default would break the big-step relation.This means we don't need to have the hacky
FlowStateanymore 🎉