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

src/heap/store-buffer.h

Index: src/heap/store-buffer.h
diff --git a/src/heap/store-buffer.h b/src/heap/store-buffer.h
index 30ef18f54f08f9c924f206dfde212e6c55c77e1f..963dafcc35e08a166e3a127a5d764549bbdc189e 100644
--- a/src/heap/store-buffer.h
+++ b/src/heap/store-buffer.h
@@ -105,6 +105,11 @@ class StoreBuffer {
 
   void Filter(int flag);
 
+
+  // Removes all the slots in [start_address, end_address) range from the store
+  // buffer.
+  void RemoveSlots(Address start_address, Address end_address);
+
  private:
   Heap* heap_;