Fix AstPrinter::VisitCallRuntime to not print garbage.

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 "src/prettyprinter.h"
 
 #include <stdarg.h>
 
 #include "src/ast-value-factory.h"
 #include "src/base/platform/platform.h"
@@ skipping 1514 matching lines @@
 
 void AstPrinter::VisitCallNew(CallNew* node) {
   IndentedScope indent(this, "CALL NEW");
   Visit(node->expression());
   PrintArguments(node->arguments());
 }
 
 
 void AstPrinter::VisitCallRuntime(CallRuntime* node) {
   EmbeddedVector<char, 128> buf;
+  SNPrintF(buf, "CALL RUNTIME %s", node->debug_name());
   IndentedScope indent(this, buf.start());
-  Print("NAME %s\n", node->debug_name());
   PrintArguments(node->arguments());
 }
 
 
 void AstPrinter::VisitUnaryOperation(UnaryOperation* node) {
   IndentedScope indent(this, Token::Name(node->op()));
   Visit(node->expression());
 }
 
 
@@ skipping 43 matching lines @@
 
 void AstPrinter::VisitSuperCallReference(SuperCallReference* node) {
   IndentedScope indent(this, "SUPER-CALL-REFERENCE");
 }
 
 
 #endif  // DEBUG
 
 }  // namespace internal
 }  // namespace v8