--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/graphbuilderconf/InvocationPlugins.java	Mon Jun 18 16:13:21 2018 +0200
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/graphbuilderconf/InvocationPlugins.java	Mon Jun 18 09:48:22 2018 -0700
@@ -948,11 +948,11 @@
      *            non-static. Upon returning, element 0 will have been rewritten to
      *            {@code declaringClass}
      */
-    public void register(InvocationPlugin plugin, Type declaringClass, String name, Type... argumentTypes) {
+    public final void register(InvocationPlugin plugin, Type declaringClass, String name, Type... argumentTypes) {
         register(plugin, false, false, declaringClass, name, argumentTypes);
     }
 
-    public void register(InvocationPlugin plugin, String declaringClass, String name, Type... argumentTypes) {
+    public final void register(InvocationPlugin plugin, String declaringClass, String name, Type... argumentTypes) {
         register(plugin, false, false, new OptionalLazySymbol(declaringClass), name, argumentTypes);
     }
 
@@ -965,7 +965,7 @@
      *            non-static. Upon returning, element 0 will have been rewritten to
      *            {@code declaringClass}
      */
-    public void registerOptional(InvocationPlugin plugin, Type declaringClass, String name, Type... argumentTypes) {
+    public final void registerOptional(InvocationPlugin plugin, Type declaringClass, String name, Type... argumentTypes) {
         register(plugin, true, false, declaringClass, name, argumentTypes);
     }