src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.phases.common/src/org/graalvm/compiler/phases/common/util/HashSetNodeEventListener.java

*** 35,45 ****
  
  /**
   * A simple {@link NodeEventListener} implementation that accumulates event nodes in a
   * {@link HashSet}.
   */
! public class HashSetNodeEventListener implements NodeEventListener {
  
      private final EconomicSet<Node> nodes;
      private final Set<NodeEvent> filter;
  
      /**
--- 35,45 ----
  
  /**
   * A simple {@link NodeEventListener} implementation that accumulates event nodes in a
   * {@link HashSet}.
   */
! public class HashSetNodeEventListener extends NodeEventListener {
  
      private final EconomicSet<Node> nodes;
      private final Set<NodeEvent> filter;
  
      /**
*** 66,76 ****
          filter.remove(e);
          return this;
      }
  
      @Override
!     public void event(NodeEvent e, Node node) {
          if (filter.contains(e)) {
              nodes.add(node);
              if (node instanceof IndirectCanonicalization) {
                  for (Node usage : node.usages()) {
                      nodes.add(usage);
--- 66,76 ----
          filter.remove(e);
          return this;
      }
  
      @Override
!     public void changed(NodeEvent e, Node node) {
          if (filter.contains(e)) {
              nodes.add(node);
              if (node instanceof IndirectCanonicalization) {
                  for (Node usage : node.usages()) {
                      nodes.add(usage);