--- old/src/share/vm/gc/cms/cmsHeap.hpp	2017-07-17 13:55:16.967945077 +0200
+++ new/src/share/vm/gc/cms/cmsHeap.hpp	2017-07-17 13:55:16.906946144 +0200
@@ -91,18 +91,17 @@
                          OopsInGenClosure* root_closure,
                          CLDClosure* cld_closure);
 
-protected:
-  void gc_prologue(bool full);
-  void gc_epilogue(bool full);
+private:
+  WorkGang* _workers;
+
+  virtual void gc_prologue(bool full);
+  virtual void gc_epilogue(bool full);
 
   // Accessor for memory state verification support
   NOT_PRODUCT(
     virtual size_t skip_header_HeapWords() { return CMSCollector::skip_header_HeapWords(); }
   )
 
-private:
-  WorkGang* _workers;
-
   // Returns success or failure.
   void create_cms_collector();