Disable short-circuiting of cons-strings when compaction is pending.

src/objects-visiting.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 139 matching lines @@
  public:
   void CopyFrom(VisitorDispatchTable* other) {
     // We are not using memcpy to guarantee that during update
     // every element of callbacks_ array will remain correct
     // pointer (memcpy might be implemented as a byte copying loop).
     for (int i = 0; i < StaticVisitorBase::kVisitorIdCount; i++) {
       NoBarrier_Store(&callbacks_[i], other->callbacks_[i]);
     }
   }
 
+  inline Callback GetVisitorById(StaticVisitorBase::VisitorId id) {
+    return reinterpret_cast<Callback>(callbacks_[id]);
+  }
+
   inline Callback GetVisitor(Map* map) {
     return reinterpret_cast<Callback>(callbacks_[map->visitor_id()]);
   }
 
   void Register(StaticVisitorBase::VisitorId id, Callback callback) {
     ASSERT(id < StaticVisitorBase::kVisitorIdCount);  // id is unsigned.
     callbacks_[id] = reinterpret_cast<AtomicWord>(callback);
   }
 
   template<typename Visitor,
@@ skipping 169 matching lines @@
 
 
 template<typename StaticVisitor>
 VisitorDispatchTable<typename StaticNewSpaceVisitor<StaticVisitor>::Callback>
   StaticNewSpaceVisitor<StaticVisitor>::table_;
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_VISITING_H_