8277371: Remove unnecessary DefNewGeneration::ref_processor_init()

Reviewed-by: stefank, tschatzl, mli

Author: albertnetymk

src/hotspot/share/gc/serial/defNewGeneration.cpp

@@ -878,11 +878,6 @@ void DefNewGeneration::record_spaces_top() {
   from()->set_top_for_allocations();
 }
 
-void DefNewGeneration::ref_processor_init() {
-  Generation::ref_processor_init();
-}
-
-
 void DefNewGeneration::update_counters() {
   if (UsePerfData) {
     _eden_counters->update_all();

src/hotspot/share/gc/serial/defNewGeneration.hpp

@@ -202,8 +202,6 @@ class DefNewGeneration: public Generation {
                    size_t max_byte_size,
                    const char* policy="Serial young collection pauses");
 
-  virtual void ref_processor_init();
-
   virtual Generation::Name kind() { return Generation::DefNew; }
 
   // Accessing spaces

src/hotspot/share/gc/shared/generation.hpp

@@ -118,7 +118,7 @@ class Generation: public CHeapObj<mtGC> {
   };
 
   // allocate and initialize ("weak") refs processing support
-  virtual void ref_processor_init();
+  void ref_processor_init();
   void set_ref_processor(ReferenceProcessor* rp) {
     assert(_ref_processor == NULL, "clobbering existing _ref_processor");
     _ref_processor = rp;