Reload length of retained_maps array after GC.

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 2613 matching lines @@
   void set(int index, Smi* value);
   void set(int index, Object* value);
   void set(int index, Object* value, WriteBarrierMode mode);
   DISALLOW_IMPLICIT_CONSTRUCTORS(WeakFixedArray);
 };
 
 
 // Generic array grows dynamically with O(1) amortized insertion.
 class ArrayList : public FixedArray {
  public:
-  static Handle<ArrayList> Add(Handle<ArrayList> array, Handle<Object> obj);
+  enum AddMode {
+    kNone,
+    // Use this if GC can delete elements from the array.
+    kReloadLengthAfterAllocation,
+  };
+  static Handle<ArrayList> Add(Handle<ArrayList> array, Handle<Object> obj,
+                               AddMode mode = kNone);
   static Handle<ArrayList> Add(Handle<ArrayList> array, Handle<Object> obj1,
-                               Handle<Object> obj2);
+                               Handle<Object> obj2, AddMode = kNone);
   inline int Length();
   inline void SetLength(int length);
   inline Object* Get(int index);
   inline Object** Slot(int index);
   inline void Set(int index, Object* obj);
   inline void Clear(int index, Object* undefined);
   DECLARE_CAST(ArrayList)
 
  private:
   static Handle<ArrayList> EnsureSpace(Handle<ArrayList> array, int length);
@@ skipping 8348 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_