Remove slots that point to unboxed doubles from the StoreBuffer/SlotsBuffer.

src/heap/mark-compact.h

Index: src/heap/mark-compact.h
diff --git a/src/heap/mark-compact.h b/src/heap/mark-compact.h
index 589bebf63f8a0e57de8079d8aab7bdf9ffc768ca..75b87b138ad77be31d0dc28d4376b9400d701b4e 100644
--- a/src/heap/mark-compact.h
+++ b/src/heap/mark-compact.h
@@ -360,6 +360,9 @@ class SlotsBuffer {
                     SlotsBuffer** buffer_address, SlotType type, Address addr,
                     AdditionMode mode);
 
+  // Removes all occurrences of given slot from the chain of slots buffers.
+  static void RemoveSlot(SlotsBuffer* buffer, ObjectSlot slot_to_remove);
+
   static const int kNumberOfElements = 1021;
 
  private: