8298651: Serial: Remove MarkSweep::follow_klass

Reviewed-by: kbarrett, tschatzl

Author: albertnetymk

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

@@ -76,7 +76,7 @@ void MarkSweep::push_objarray(oop obj, size_t index) {
 }
 
 void MarkSweep::follow_array(objArrayOop array) {
-  MarkSweep::follow_klass(array->klass());
+  mark_and_push_closure.do_klass(array->klass());
   // Don't push empty arrays to avoid unnecessary work.
   if (array->length() > 0) {
     MarkSweep::push_objarray(array, 0);
@@ -203,11 +203,6 @@ template <class T> void MarkSweep::mark_and_push(T* p) {
   }
 }
 
-void MarkSweep::follow_klass(Klass* klass) {
-  oop op = klass->class_loader_data()->holder_no_keepalive();
-  MarkSweep::mark_and_push(&op);
-}
-
 template <typename T>
 void MarkAndPushClosure::do_oop_work(T* p)            { MarkSweep::mark_and_push(p); }
 void MarkAndPushClosure::do_oop(      oop* p)         { do_oop_work(p); }

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

@@ -148,8 +148,6 @@ class MarkSweep : AllStatic {
 
   static void follow_stack();   // Empty marking stack.
 
-  static void follow_klass(Klass* klass);
-
   template <class T> static inline void adjust_pointer(T* p);
 
   // Check mark and maybe push on marking stack