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

Source/core/svg/SVGGradientElement.h

Index: Source/core/svg/SVGGradientElement.h
diff --git a/Source/core/svg/SVGGradientElement.h b/Source/core/svg/SVGGradientElement.h
index 4c3778255aebdd577f19d187573e8efb2de2e60c..b6df574b13729bca2dc55d6bfe4aed93af101315 100644
--- a/Source/core/svg/SVGGradientElement.h
+++ b/Source/core/svg/SVGGradientElement.h
@@ -73,12 +73,12 @@ private:
     RefPtr<SVGAnimatedEnumeration<SVGUnitTypes::SVGUnitType> > m_gradientUnits;
 };
 
-inline bool isSVGGradientElement(const Node& node)
+inline bool isSVGGradientElement(const SVGElement& element)
 {
-    return node.hasTagName(SVGNames::radialGradientTag) || node.hasTagName(SVGNames::linearGradientTag);
+    return element.hasTagName(SVGNames::radialGradientTag) || element.hasTagName(SVGNames::linearGradientTag);
 }
 
-DEFINE_ELEMENT_TYPE_CASTS_WITH_FUNCTION(SVGGradientElement);
+DEFINE_SVGELEMENT_TYPE_CASTS_WITH_FUNCTION(SVGGradientElement);
 
 } // namespace blink