Adapt source position recording and fix ScopeIterator.

src/ast.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 1150 matching lines @@
   Variable* var_;  // resolved variable, or NULL
   bool is_this_;
   bool is_trivial_;
   int position_;
 
   VariableProxy(Isolate* isolate,
                 Handle<String> name,
                 bool is_this,
                 int position = RelocInfo::kNoPosition);
 
+  friend class Rewriter;
   friend class Scope;
 };
 
 
 class Property: public Expression {
  public:
   Property(Isolate* isolate,
            Expression* obj,
            Expression* key,
            int pos)
@@ skipping 986 matching lines @@
 
  private:
   Isolate* isolate_;
   bool stack_overflow_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_AST_H_