[heap] Avoid the use of cells to point from code to new-space 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 339748cbd723e5aedd36906e721924e98e54244c..40bcb9d6d05d834e9e36d4f730fb5b642a352942 100644
--- a/src/heap/remembered-set.h
+++ b/src/heap/remembered-set.h
@@ -227,6 +227,8 @@ class RememberedSet {
   }
 
   static bool IsValidSlot(Heap* heap, MemoryChunk* chunk, Object** slot);
+  static bool IsValidTypedSlot(Heap* heap, MemoryChunk* chunk, SlotType type,
+                               Address host_addr, Address slot);
 };
 
 class UpdateTypedSlotHelper {