Make manual isSVG*Element() helpers as efficient as the generated ones

Source/core/svg/SVGElement.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
  * Copyright (C) 2009, 2014 Apple Inc. All rights reserved.
  *
  * 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
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 253 matching lines @@
 DEFINE_ELEMENT_TYPE_CASTS(SVGElement, isSVGElement());
 
 template <typename T> bool isElementOfType(const SVGElement&);
 template <> inline bool isElementOfType<const SVGElement>(const SVGElement&) { return true; }
 
 inline bool Node::hasTagName(const SVGQualifiedName& name) const
 {
     return isSVGElement() && toSVGElement(*this).hasTagName(name);
 }
 
+// This requires isSVG*Element(const SVGElement&).
+#define DEFINE_SVGELEMENT_TYPE_CASTS_WITH_FUNCTION(thisType) \
+    inline bool is##thisType(const thisType* element); \
+    inline bool is##thisType(const thisType& element); \
+    inline bool is##thisType(const SVGElement* element) { return element && is##thisType(*element); } \
+    inline bool is##thisType(const Node& node) { return node.isSVGElement() ? is##thisType(toSVGElement(node)) : false; } \
+    inline bool is##thisType(const Node* node) { return node && is##thisType(*node); } \
+    template<typename T> inline bool is##thisType(const PassRefPtr<T>& node) { return is##thisType(node.get()); } \
+    template<typename T> inline bool is##thisType(const RefPtr<T>& node) { return is##thisType(node.get()); } \
+    template <> inline bool isElementOfType<const thisType>(const SVGElement& element) { return is##thisType(element); } \
+    DEFINE_ELEMENT_TYPE_CASTS_WITH_FUNCTION(thisType)
+
 }
 
 #include "core/SVGElementTypeHelpers.h"
 
 #endif