Consistently cache ElementData::length() before loops

Source/core/html/HTMLObjectElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Stefan Schimanski (1Stein@gmx.de)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 165 matching lines @@
     // we have to explicitly suppress the tag's CODEBASE attribute if there is none in a PARAM,
     // else our Java plugin will misinterpret it. [4004531]
     String codebase;
     if (MIMETypeRegistry::isJavaAppletMIMEType(serviceType)) {
         codebase = "codebase";
         uniqueParamNames.add(codebase.impl()); // pretend we found it in a PARAM already
     }
 
     // Turn the attributes of the <object> element into arrays, but don't override <param> values.
     if (hasAttributes()) {
-        for (unsigned i = 0; i < attributeCount(); ++i) {
+        unsigned attributeCount = this->attributeCount();
+        for (unsigned i = 0; i < attributeCount; ++i) {
             const Attribute* attribute = attributeItem(i);
             const AtomicString& name = attribute->name().localName();
             if (!uniqueParamNames.contains(name.impl())) {
                 paramNames.append(name.string());
                 paramValues.append(attribute->value().string());
             }
         }
     }
 
     mapDataParamToSrc(&paramNames, &paramValues);
@@ skipping 279 matching lines @@
 {
     return fastHasAttribute(usemapAttr);
 }
 
 bool HTMLObjectElement::useFallbackContent() const
 {
     return HTMLPlugInElement::useFallbackContent() || m_useFallbackContent;
 }
 
 }