Use a bitmask for SVG render object types

Source/core/rendering/svg/RenderSVGShape.h

Index: Source/core/rendering/svg/RenderSVGShape.h
diff --git a/Source/core/rendering/svg/RenderSVGShape.h b/Source/core/rendering/svg/RenderSVGShape.h
index f800b2db555728096d0f41c7ab6b8a52bd3a685e..8ea8b21d1f53dbced58488589135ee31dc9e2b92 100644
--- a/Source/core/rendering/svg/RenderSVGShape.h
+++ b/Source/core/rendering/svg/RenderSVGShape.h
@@ -89,8 +89,8 @@ private:
     virtual const AffineTransform& localToParentTransform() const OVERRIDE FINAL { return m_localTransform; }
     virtual AffineTransform localTransform() const OVERRIDE FINAL { return m_localTransform; }
 
-    virtual bool isSVGShape() const OVERRIDE FINAL { return true; }
     virtual const char* renderName() const { return "RenderSVGShape"; }
+    virtual SVGType getSVGType() const OVERRIDE { return IsSVGShape; }
 
     virtual void layout() OVERRIDE FINAL;
     virtual void paint(PaintInfo&, const LayoutPoint&) OVERRIDE FINAL;