--- old/src/share/vm/memory/metachunk.hpp	2016-03-11 01:25:33.000000000 +0300
+++ new/src/share/vm/memory/metachunk.hpp	2016-03-11 01:25:33.000000000 +0300
@@ -145,7 +145,11 @@
 
   bool contains(const void* ptr) { return bottom() <= ptr && ptr < _top; }
 
-  NOT_PRODUCT(void mangle();)
+#ifndef PRODUCT
+  static const size_t metadata_chunk_initialize = 0xf7f7f7f7;
+
+  void mangle(juint wordValue = metadata_chunk_initialize);
+#endif
 
   void print_on(outputStream* st) const;
   void verify();