Revert of Reland of 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 ef72d87296b5b5539ac540c481832ff11b6e889f..fbe8bb953b680075fd1e13af5fcc65ceffcdd21d 100644
--- a/src/heap/mark-compact.h
+++ b/src/heap/mark-compact.h
@@ -359,9 +359,6 @@
   static bool AddTo(SlotsBufferAllocator* allocator,
                     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;