Speed up clearing of old to new slots in dead objects.

src/heap/remembered-set.h

Index: src/heap/remembered-set.h
diff --git a/src/heap/remembered-set.h b/src/heap/remembered-set.h
index 2631e1e3aee10daa00641ef8b7e69ec27390a3d2..bfba8893ea8f9504dcb5562f09dc0b99c119a929 100644
--- a/src/heap/remembered-set.h
+++ b/src/heap/remembered-set.h
@@ -236,7 +236,7 @@ class RememberedSet {
     return REMOVE_SLOT;
   }
 
-  static bool IsValidSlot(Heap* heap, Object** slot);
+  static bool IsValidSlot(Heap* heap, MemoryChunk* chunk, Object** slot);
 };
 
 // Buffer for keeping thead local migration slots during compaction.