[parser] fix null-dereference in DoExpression rewriting

src/parsing/parser.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_PARSING_PARSER_H_
 #define V8_PARSING_PARSER_H_
 
 #include "src/allocation.h"
 #include "src/ast/ast.h"
 #include "src/ast/scopes.h"
@@ skipping 717 matching lines @@
   Statement* ParseStatement(ZoneList<const AstRawString*>* labels, bool* ok);
   Statement* ParseSubStatement(ZoneList<const AstRawString*>* labels, bool* ok);
   Statement* ParseStatementAsUnlabelled(ZoneList<const AstRawString*>* labels,
                                    bool* ok);
   Statement* ParseFunctionDeclaration(ZoneList<const AstRawString*>* names,
                                       bool* ok);
   Statement* ParseClassDeclaration(ZoneList<const AstRawString*>* names,
                                    bool* ok);
   Statement* ParseNativeDeclaration(bool* ok);
   Block* ParseBlock(ZoneList<const AstRawString*>* labels, bool* ok);
+  Block* ParseBlock(ZoneList<const AstRawString*>* labels,
+                    bool finalize_block_scope, bool* ok);
   Block* ParseVariableStatement(VariableDeclarationContext var_context,
                                 ZoneList<const AstRawString*>* names,
                                 bool* ok);
   DoExpression* ParseDoExpression(bool* ok);
 
   struct DeclarationDescriptor {
     enum Kind { NORMAL, PARAMETER };
     Parser* parser;
     Scope* scope;
     Scope* hoist_scope;
@@ skipping 439 matching lines @@
 
 DoExpression* ParserTraits::ParseDoExpression(bool* ok) {
   return parser_->ParseDoExpression(ok);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PARSER_H_