Immediatelly promote marked objects

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index 150647fbc7c0d2ad31dcc8a36ceaa8e01e54b833..da0ae7b7f76ed7a6eda4ea20dc3a84197261994e 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -302,6 +302,7 @@ class ScavengeJob;
 class WeakObjectRetainer;
 
 enum PromotionMode { FORCE_PROMOTION, DEFAULT_PROMOTION };
+enum MarksHandling { TRANSFER_MARKS, IGNORE_MARKS };
 
 typedef void (*ObjectSlotCallback)(HeapObject** from, HeapObject* to,
                                    PromotionMode mode);
@@ -777,6 +778,7 @@ class Heap {
 
   // An object should be promoted if the object has survived a
   // scavenge operation.
+  template <MarksHandling marks_handling>
   inline bool ShouldBePromoted(Address old_address, int object_size);
 
   void ClearNormalizedMapCaches();