*** old/src/share/vm/memory/metachunk.hpp	Mon Mar 14 20:37:46 2016
--- new/src/share/vm/memory/metachunk.hpp	Mon Mar 14 20:37:45 2016

*** 143,153 ****
--- 143,157 ----
    void set_is_tagged_free(bool v) { _is_tagged_free = v; }
  #endif
  
    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 word_value = metadata_chunk_initialize);
+ #endif
  
    void print_on(outputStream* st) const;
    void verify();
  };