Make classes and structures in core/paint fast-allocated.

Source/core/paint/SVGContainerPainter.h

Index: Source/core/paint/SVGContainerPainter.h
diff --git a/Source/core/paint/SVGContainerPainter.h b/Source/core/paint/SVGContainerPainter.h
index 66145101139ebeaaf0c18f6789444f855c98c7d6..0e7b18163f35b3229f1949d11a12c9c554482018 100644
--- a/Source/core/paint/SVGContainerPainter.h
+++ b/Source/core/paint/SVGContainerPainter.h
@@ -5,12 +5,15 @@
 #ifndef SVGContainerPainter_h
 #define SVGContainerPainter_h
 
+#include "wtf/Allocator.h"
+
 namespace blink {
 
 struct PaintInfo;
 class LayoutSVGContainer;
 
 class SVGContainerPainter {
+    STACK_ALLOCATED();
 public:
     SVGContainerPainter(LayoutSVGContainer& layoutSVGContainer) : m_layoutSVGContainer(layoutSVGContainer) { }