use exported message name to construct super class name

Author: javeleon

espresso/src/com.oracle.truffle.espresso.processor/src/com/oracle/truffle/espresso/processor/InteropNodesProcessor.java

@@ -286,10 +286,10 @@ final InteropMessage create(InteropMessage.Message message) {
 
     private ClassBuilder processInteropNode(TypeElement processingClass, ExecutableElement element, String exportedMessageName, String clsName, Imports imports) {
         String targetMethodName = element.getSimpleName().toString();
-        /*- abstract static class [exportedMessageName]Node extends InteropMessage.[targetMethodName] */
+        /*- abstract static class [exportedMessageName]Node extends InteropMessage.[exportedMessageName] */
         ClassBuilder result = new ClassBuilder(clsName) //
                         .withQualifiers(new ModifierBuilder().asStatic().asAbstract()) //
-                        .withSuperClass(INTEROP_MESSAGE + "." + ProcessorUtils.capitalize(targetMethodName));
+                        .withSuperClass(INTEROP_MESSAGE + "." + ProcessorUtils.capitalize(exportedMessageName));
 
         /*- 
             @Specialization