[es6] new.target should not be shadowable in a with scope

src/ast.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_AST_H_
 #define V8_AST_H_
 
 #include "src/v8.h"
 
 #include "src/assembler.h"
@@ skipping 2809 matching lines @@
 
  protected:
   SuperCallReference(Zone* zone, VariableProxy* this_var,
                      VariableProxy* new_target_var,
                      VariableProxy* this_function_var, int pos)
       : Expression(zone, pos),
         this_var_(this_var),
         new_target_var_(new_target_var),
         this_function_var_(this_function_var) {
     DCHECK(this_var->is_this());
-    DCHECK(new_target_var->raw_name()->IsOneByteEqualTo("new.target"));
+    DCHECK(new_target_var->raw_name()->IsOneByteEqualTo(".new.target"));
     DCHECK(this_function_var->raw_name()->IsOneByteEqualTo(".this_function"));
   }
 
  private:
   VariableProxy* this_var_;
   VariableProxy* new_target_var_;
   VariableProxy* this_function_var_;
 };
 
 
@@ skipping 784 matching lines @@
 
  private:
   Zone* zone_;
   AstValueFactory* ast_value_factory_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_AST_H_