diff -r 9509c20bba28 -r 0b3d1ec6eaee src/share/vm/gc_implementation/g1/heapRegionSet.hpp
--- a/src/share/vm/gc_implementation/g1/heapRegionSet.hpp	Mon Jan 16 22:10:05 2012 +0100
+++ b/src/share/vm/gc_implementation/g1/heapRegionSet.hpp	Wed Jan 18 10:30:12 2012 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2011, 2012, 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
@@ -59,6 +59,7 @@
 class HeapRegionSetBase VALUE_OBJ_CLASS_SPEC {
   friend class hrs_ext_msg;
   friend class HRSPhaseSetter;
+  friend class VMStructs;
 
 protected:
   static size_t calculate_region_num(HeapRegion* hr);