Add stub implementations of flowCheckNodeSpecific

python/ql/lib/semmle/python/dataflow/new/internal/DataFlowPrivate.qll

@@ -497,6 +497,11 @@ class CastNode extends Node {
   CastNode() { readStep(_, _, this) or storeStep(_, _, this) }
 }
 
+/**
+ * Holds if `n` should be a FlowCheckNode, which will appear in path summaries.
+ */
+predicate flowCheckNodeSpecific(Node n) { none() }
+
 /**
  * Holds if `t1` and `t2` are compatible, that is, whether data can flow from
  * a node of type `t1` to a node of type `t2`.