Robustify the clearing of the cache of map-related ICs on the map.

src/mark-compact.h

Index: src/mark-compact.h
===================================================================
--- src/mark-compact.h	(revision 10437)
+++ src/mark-compact.h	(working copy)
@@ -624,10 +624,16 @@
 
   void AfterMarking();
 
+  // Marks the object black and pushes it on the marking stack.
+  // This is for non-incremental marking.
   INLINE(void MarkObject(HeapObject* obj, MarkBit mark_bit));
 
+  // Marks the object black.  This is for non-incremental marking.
   INLINE(void SetMark(HeapObject* obj, MarkBit mark_bit));
 
+  // Clears the cache of ICs related to this map.
+  INLINE(void ClearCacheOnMap(Map* map));
+
   void ProcessNewlyMarkedObject(HeapObject* obj);
 
   // Creates back pointers for all map transitions, stores them in