A change in the way we place TransitionElementKinds in the tree.

src/ast.h

 // Copyright 2012 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 257 matching lines @@
   void Clear() { list_.Clear(); }
   void Sort() { list_.Sort(); }
 
   bool is_empty() const { return list_.is_empty(); }
   int length() const { return list_.length(); }
 
   void Add(Handle<Map> handle, Zone* zone) {
     list_.Add(handle.location(), zone);
   }
 
+  void Remove(Handle<Map> handle) {
+    list_.RemoveElement(handle.location());
+  }
+  
   Handle<Map> at(int i) const {
     return Handle<Map>(list_.at(i));
   }
 
   Handle<Map> first() const { return at(0); }
   Handle<Map> last() const { return at(length() - 1); }
 
  private:
   // The list stores pointers to Map*, that is Map**, so it's GC safe.
   SmallPointerList<Map*> list_;
@@ skipping 2608 matching lines @@
  private:
   Isolate* isolate_;
   Zone* zone_;
   Visitor visitor_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_AST_H_