JS: Name ClassInstance nodes differently

Author: asgerf

javascript/ql/lib/semmle/javascript/ApiGraphs.qll

@@ -616,6 +616,11 @@ module API {
     override string toString() { result = "def " + this.getInducingNode().toString() }
   }
 
+  /** A node corresponding to a definition of an API component. */
+  class ClassInstanceNode extends Definition, Impl::MkClassInstance {
+    override string toString() { result = "instance of " + this.getInducingNode().toString() }
+  }
+
   /** A node corresponding to the use of an API component. */
   class Use extends Node, Impl::TUse {
     override string toString() { result = "use " + this.getInducingNode().toString() }