8304410: [Lilliput/JDK17] Remove unneeded code in ContiguousSpace::object_iterate_from()

Reviewed-by: shade

Author: rkennke

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

@@ -485,13 +485,7 @@ void ContiguousSpace::object_iterate(ObjectClosure* blk) {
 void ContiguousSpace::object_iterate_from(HeapWord* mark, ObjectClosure* blk) {
   while (mark < top()) {
     blk->do_object(cast_to_oop(mark));
-    oop obj = cast_to_oop(mark);
-#ifdef _LP64
-    if (obj->is_forwarded() && CompressedKlassPointers::is_null(obj->mark().narrow_klass())) {
-      obj = obj->forwardee();
-    }
-#endif
-    mark += obj->size();
+    mark += cast_to_oop(mark)->size();
   }
 }