[destructuring] Adapting PatternRewriter to work in for-statements.

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 3349 matching lines @@
   VariableProxy* NewVariableProxy(Variable* var,
                                   int start_position = RelocInfo::kNoPosition,
                                   int end_position = RelocInfo::kNoPosition) {
     return new (zone_) VariableProxy(zone_, var, start_position, end_position);
   }
 
   VariableProxy* NewVariableProxy(const AstRawString* name,
                                   Variable::Kind variable_kind,
                                   int start_position = RelocInfo::kNoPosition,
                                   int end_position = RelocInfo::kNoPosition) {
+    DCHECK_NOT_NULL(name);
     return new (zone_)
         VariableProxy(zone_, name, variable_kind, start_position, end_position);
   }
 
   Property* NewProperty(Expression* obj, Expression* key, int pos) {
     return new (zone_) Property(zone_, obj, key, pos);
   }
 
   Call* NewCall(Expression* expression,
                 ZoneList<Expression*>* arguments,
@@ skipping 122 matching lines @@
 
  private:
   Zone* zone_;
   AstValueFactory* ast_value_factory_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_AST_H_