diff -r 0152ad7b38b8 -r 6df94ce3ab2f src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.phases.common/src/org/graalvm/compiler/phases/common/ConditionalEliminationPhase.java
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.phases.common/src/org/graalvm/compiler/phases/common/ConditionalEliminationPhase.java	Tue Sep 24 08:54:08 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.phases.common/src/org/graalvm/compiler/phases/common/ConditionalEliminationPhase.java	Tue Sep 24 12:47:15 2019 -0400
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -309,7 +309,7 @@
             this.conditions = new ArrayDeque<>();
             tool = GraphUtil.getDefaultSimplifier(context.getMetaAccess(), context.getConstantReflection(), context.getConstantFieldProvider(), false, graph.getAssumptions(), graph.getOptions(),
                             context.getLowerer());
-            mergeMaps = EconomicMap.create();
+            mergeMaps = EconomicMap.create(Equivalence.IDENTITY);
         }
 
         protected void processConditionAnchor(ConditionAnchorNode node) {
@@ -616,7 +616,7 @@
                         Stamp newStamp = infoElement.getStamp();
                         if (phi.stamp(NodeView.DEFAULT).tryImproveWith(newStamp) != null) {
                             if (mergeMap == null) {
-                                mergeMap = EconomicMap.create();
+                                mergeMap = EconomicMap.create(Equivalence.IDENTITY);
                                 mergeMaps.put(merge, mergeMap);
                             }