--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.replacements/src/org/graalvm/compiler/replacements/ArraySubstitutions.java	Tue Sep 24 08:54:08 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.replacements/src/org/graalvm/compiler/replacements/ArraySubstitutions.java	Tue Sep 24 12:47:15 2019 -0400
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 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
@@ -29,6 +29,7 @@
 import org.graalvm.compiler.api.replacements.ClassSubstitution;
 import org.graalvm.compiler.api.replacements.MethodSubstitution;
 import org.graalvm.compiler.nodes.DeoptimizeNode;
+import org.graalvm.compiler.nodes.extended.BranchProbabilityNode;
 import org.graalvm.compiler.nodes.java.ArrayLengthNode;
 
 import jdk.vm.ci.meta.DeoptimizationAction;
@@ -44,7 +45,7 @@
 
     @MethodSubstitution
     public static int getLength(Object array) {
-        if (!array.getClass().isArray()) {
+        if (BranchProbabilityNode.probability(BranchProbabilityNode.DEOPT_PROBABILITY, !array.getClass().isArray())) {
             DeoptimizeNode.deopt(DeoptimizationAction.None, DeoptimizationReason.RuntimeConstraint);
         }
         return ArrayLengthNode.arrayLength(array);