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rev 11970 : [mq]: base_volatiles

@@ -182,11 +182,11 @@
   HeapWord* mem_allocate(size_t size, bool*  gc_overhead_limit_was_exceeded);
   // We may support a shared contiguous allocation area, if the youngest
   // generation does.
   bool supports_inline_contig_alloc() const;
-  HeapWord** top_addr() const;
+  HeapWord* volatile* top_addr() const;
   HeapWord** end_addr() const;
   // Perform a full collection of the heap; intended for use in implementing
   // "System.gc". This implies as full a collection as the CollectedHeap
   // supports. Caller does not hold the Heap_lock on entry.
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