--- old/src/share/vm/gc/shared/gcTimer.hpp	2015-12-15 14:11:27.192651336 -0800
+++ new/src/share/vm/gc/shared/gcTimer.hpp	2015-12-15 14:11:27.100651339 -0800
@@ -162,12 +162,10 @@
 class ConcurrentGCTimer : public GCTimer {
   // ConcurrentGCTimer can't be used if there is an overlap between a pause phase and a concurrent phase.
   // _is_concurrent_phase_active is used to find above case.
-  NOT_PRODUCT(volatile bool _is_concurrent_phase_active;)
+  bool _is_concurrent_phase_active;
 
  public:
-#ifndef PRODUCT
   ConcurrentGCTimer(): GCTimer(), _is_concurrent_phase_active(false) {};
-#endif
 
   void register_gc_pause_start(const char* name);
   void register_gc_pause_end();