Preprocess structured stack trace on GC to get rid of code reference.

src/objects.h

 // Copyright 2012 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_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 2614 matching lines @@
       Handle<Object> maybe_array, Handle<HeapObject> value,
       SearchForDuplicates search_for_duplicates = kAlwaysAdd,
       bool* was_present = NULL);
 
   // Returns true if an entry was found and removed.
   bool Remove(Handle<HeapObject> value);
 
   void Compact();
 
   inline Object* Get(int index) const;
+  inline void Clear(int index);
   inline int Length() const;
 
+  inline bool IsEmptySlot(int index) const;
   static Object* Empty() { return Smi::FromInt(0); }
 
   DECLARE_CAST(WeakFixedArray)
 
  private:
   static const int kLastUsedIndexIndex = 0;
   static const int kFirstIndex = 1;
 
   static Handle<WeakFixedArray> Allocate(
       Isolate* isolate, int size, Handle<WeakFixedArray> initialize_from);
 
   static void Set(Handle<WeakFixedArray> array, int index,
                   Handle<HeapObject> value);
   inline void clear(int index);
-  inline bool IsEmptySlot(int index) const;
 
   inline int last_used_index() const;
   inline void set_last_used_index(int index);
 
   // Disallow inherited setters.
   void set(int index, Smi* value);
   void set(int index, Object* value);
   void set(int index, Object* value, WriteBarrierMode mode);
   DISALLOW_IMPLICIT_CONSTRUCTORS(WeakFixedArray);
 };
@@ skipping 8441 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_