--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.graph/src/org/graalvm/compiler/graph/NodeMap.java	Thu Jul 25 11:44:37 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.graph/src/org/graalvm/compiler/graph/NodeMap.java	Thu Jul 25 17:35:58 2019 -0400
@@ -127,6 +127,7 @@
     private boolean check(Node node) {
         assert node.graph() == graph : String.format("%s is not part of the graph", node);
         assert !isNew(node) : "this node was added to the graph after creating the node map : " + node;
+        assert node.isAlive() : "this node is not alive: " + node;
         return true;
     }