8324207: Serial: Remove Space::set_saved_mark_word

Reviewed-by: tschatzl, stefank

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

@@ -41,7 +41,6 @@ void DefNewGeneration::oop_since_save_marks_iterate(OopClosureType* cl) {
   assert(from()->saved_mark_at_top(), "inv");
 
   to()->oop_since_save_marks_iterate(cl);
-  to()->set_saved_mark();
 }
 
 #endif // SHARE_GC_SERIAL_DEFNEWGENERATION_INLINE_HPP

src/hotspot/share/gc/serial/tenuredGeneration.inline.hpp

@@ -68,8 +68,6 @@ bool TenuredGeneration::block_is_obj(const HeapWord* addr) const {
 template <typename OopClosureType>
 void TenuredGeneration::oop_since_save_marks_iterate(OopClosureType* blk) {
   _the_space->oop_since_save_marks_iterate(blk);
-
-  save_marks();
 }
 
 #endif // SHARE_GC_SERIAL_TENUREDGENERATION_INLINE_HPP

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

@@ -82,8 +82,6 @@ class Space: public CHeapObj<mtGC> {
 
   HeapWord* saved_mark_word() const  { return _saved_mark_word; }
 
-  void set_saved_mark_word(HeapWord* p) { _saved_mark_word = p; }
-
   // Returns a subregion of the space containing only the allocated objects in
   // the space.
   virtual MemRegion used_region() const = 0;

src/hotspot/share/gc/shared/space.inline.hpp

@@ -71,13 +71,12 @@ void ContiguousSpace::oop_since_save_marks_iterate(OopClosureType* blk) {
     t = top();
     while (p < t) {
       Prefetch::write(p, interval);
-      debug_only(HeapWord* prev = p);
       oop m = cast_to_oop(p);
       p += m->oop_iterate_size(blk);
     }
   } while (t < top());
 
-  set_saved_mark_word(p);
+  set_saved_mark();
 }
 
 #endif // SHARE_GC_SHARED_SPACE_INLINE_HPP