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

Source/core/paint/BoxPainter.h

Index: Source/core/paint/BoxPainter.h
diff --git a/Source/core/paint/BoxPainter.h b/Source/core/paint/BoxPainter.h
index c8c46873e47ffad6dc121640f4f25d8ffcb2de3e..a720bc2927eb7c65b894eaa01e7eb08a6140b518 100644
--- a/Source/core/paint/BoxPainter.h
+++ b/Source/core/paint/BoxPainter.h
@@ -7,6 +7,7 @@
 
 #include "core/layout/LayoutBoxModelObject.h"
 #include "core/paint/ObjectPainter.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
@@ -18,6 +19,7 @@ class LayoutBox;
 class LayoutObject;
 
 class BoxPainter {
+    STACK_ALLOCATED();
 public:
     BoxPainter(LayoutBox& layoutBox) : m_layoutBox(layoutBox) { }
     void paint(const PaintInfo&, const LayoutPoint&);