Make sure we don't accidentially serialize type feedback

src/type-feedback-vector.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_TYPE_FEEDBACK_VECTOR_H_
 #define V8_TYPE_FEEDBACK_VECTOR_H_
 
 #include <vector>
 
 #include "src/checks.h"
@@ skipping 148 matching lines @@
 
   static Handle<TypeFeedbackVector> Allocate(Isolate* isolate,
                                              const FeedbackVectorSpec& spec);
 
   static Handle<TypeFeedbackVector> Copy(Isolate* isolate,
                                          Handle<TypeFeedbackVector> vector);
 
   // Clears the vector slots and the vector ic slots.
   void ClearSlots(SharedFunctionInfo* shared);
 
+  // Returns true if all slots are clear.
+  bool IsCleared();
+
   // The object that indicates an uninitialized cache.
   static inline Handle<Object> UninitializedSentinel(Isolate* isolate);
 
   // The object that indicates a megamorphic state.
   static inline Handle<Object> MegamorphicSentinel(Isolate* isolate);
 
   // The object that indicates a premonomorphic state.
   static inline Handle<Object> PremonomorphicSentinel(Isolate* isolate);
 
   // The object that indicates a generic state.
@@ skipping 182 matching lines @@
   int ExtractMaps(MapHandleList* maps) const OVERRIDE;
   MaybeHandle<Code> FindHandlerForMap(Handle<Map> map) const OVERRIDE;
   virtual bool FindHandlers(CodeHandleList* code_list,
                             int length = -1) const OVERRIDE;
   Name* FindFirstName() const OVERRIDE;
 };
 }
 }  // namespace v8::internal
 
 #endif  // V8_TRANSITIONS_H_