8302868: Serial: Remove CardTableRS::initialize

Reviewed-by: tschatzl

Author: albertnetymk

src/hotspot/share/gc/shared/cardTableRS.cpp

@@ -434,10 +434,6 @@ void CardTableRS::verify() {
 CardTableRS::CardTableRS(MemRegion whole_heap) :
   CardTable(whole_heap) { }
 
-void CardTableRS::initialize() {
-  CardTable::initialize();
-}
-
 void CardTableRS::non_clean_card_iterate(TenuredSpace* sp,
                                          MemRegion mr,
                                          OopIterateClosure* cl,

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

@@ -62,7 +62,6 @@ class CardTableRS : public CardTable {
   }
 
   void verify();
-  void initialize() override;
 
   void clear_into_younger(Generation* old_gen);