--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core/src/org/graalvm/compiler/core/phases/EconomyMidTier.java	Thu Jun 27 03:10:52 2019 +0200
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core/src/org/graalvm/compiler/core/phases/EconomyMidTier.java	Thu Jun 27 03:33:44 2019 +0200
@@ -35,6 +35,7 @@
 import org.graalvm.compiler.phases.common.LoopSafepointInsertionPhase;
 import org.graalvm.compiler.phases.common.LoweringPhase;
 import org.graalvm.compiler.phases.common.RemoveValueProxyPhase;
+import org.graalvm.compiler.phases.common.WriteBarrierAdditionPhase;
 import org.graalvm.compiler.phases.tiers.MidTierContext;
 
 public class EconomyMidTier extends PhaseSuite<MidTierContext> {
@@ -53,5 +54,7 @@
         appendPhase(new LoweringPhase(canonicalizer, LoweringTool.StandardLoweringStage.MID_TIER));
 
         appendPhase(new FrameStateAssignmentPhase());
+
+        appendPhase(new WriteBarrierAdditionPhase());
     }
 }