[es6] Fix completion values of for loops with lexical variables

src/prettyprinter.cc

 // 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.
 
 #include <stdarg.h>
 
 #include "src/v8.h"
 
 #include "src/ast-value-factory.h"
 #include "src/base/platform/platform.h"
@@ skipping 415 matching lines @@
   InitializeAstVisitor(isolate, zone);
 }
 
 
 PrettyPrinter::~PrettyPrinter() {
   DeleteArray(output_);
 }
 
 
 void PrettyPrinter::VisitBlock(Block* node) {
-  if (!node->is_initializer_block()) Print("{ ");
+  if (!node->ignore_completion_value()) Print("{ ");
   PrintStatements(node->statements());
   if (node->statements()->length() > 0) Print(" ");
-  if (!node->is_initializer_block()) Print("}");
+  if (!node->ignore_completion_value()) Print("}");
 }
 
 
 void PrettyPrinter::VisitVariableDeclaration(VariableDeclaration* node) {
   Print("var ");
   PrintLiteral(node->proxy()->name(), false);
   Print(";");
 }
 
 
@@ skipping 689 matching lines @@
 
 
 void AstPrinter::PrintArguments(ZoneList<Expression*>* arguments) {
   for (int i = 0; i < arguments->length(); i++) {
     Visit(arguments->at(i));
   }
 }
 
 
 void AstPrinter::VisitBlock(Block* node) {
-  const char* block_txt = node->is_initializer_block() ? "BLOCK INIT" : "BLOCK";
+  const char* block_txt =
+      node->ignore_completion_value() ? "BLOCK NOCOMPLETIONS" : "BLOCK";
   IndentedScope indent(this, block_txt);
   PrintStatements(node->statements());
 }
 
 
 // TODO(svenpanne) Start with IndentedScope.
 void AstPrinter::VisitVariableDeclaration(VariableDeclaration* node) {
   PrintLiteralWithModeIndented(Variable::Mode2String(node->mode()),
                                node->proxy()->var(),
                                node->proxy()->name());
@@ skipping 382 matching lines @@
 
 void AstPrinter::VisitSuperCallReference(SuperCallReference* node) {
   IndentedScope indent(this, "SUPER-CALL-REFERENCE");
 }
 
 
 #endif  // DEBUG
 
 }  // namespace internal
 }  // namespace v8