Internals: Use runtime type info instead of dynamic_cast for faster graph type checks (#4397)

src/V3Task.cpp

@@ -85,6 +85,7 @@ public:
 };
 
 class TaskEdge final : public V3GraphEdge {
+    VL_RTTI_IMPL(TaskEdge, V3GraphEdge)
 public:
     TaskEdge(V3Graph* graphp, TaskBaseVertex* fromp, TaskBaseVertex* top)
         : V3GraphEdge{graphp, fromp, top, 1, false} {}