8016839: JSR292: AME instead of IAE when calling a method

Summary: Catch missing-because-illegal case for itable entries and use an exception-throwing method instead of null.
Reviewed-by: acorn, jrose, coleenp
Contributed-by: david.r.chase@oracle.com

src/share/classes/sun/misc/Unsafe.java

 /*
- * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2013, 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
@@ -1131,4 +1131,12 @@ public final class Unsafe {
      */
     public native void fullFence();
 
+    /**
+     * Throws IllegalAccessError; for use by the VM.
+     * @since 1.8
+     */
+    private static void throwIllegalAccessError() {
+       throw new IllegalAccessError();
+    }
+
 }