JS: Further restrict receiver type inference

Author: asger-semmle

javascript/ql/src/semmle/javascript/dataflow/Nodes.qll

@@ -706,7 +706,8 @@ class ClassNode extends DataFlow::SourceNode {
     result = getAClassReference(t.continue()).getAnInstantiation()
     or
     t.start() and
-    result.(AnalyzedNode).getAValue() = getAbstractInstanceValue()
+    result.(AnalyzedNode).getAValue() = getAbstractInstanceValue() and
+    not result = any(DataFlow::ClassNode cls).getAReceiverNode()
     or
     t.start() and
     result = getAReceiverNode()