8248133: SerialGC: Unify handling of all OopStorage instances in root processing

Reviewed-by: eosterlund, kbarrett, pliden

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

@@ -95,6 +95,9 @@ public:
   static OopStorage* resolved_method_table_weak() {
     return storage(resolved_method_table_weak_index);
   }
+
+  template <typename Closure>
+  static void strong_oops_do(Closure* cl);
 };
 
 class OopStorageSet::Iterator {