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

Source/core/paint/SVGInlineFlowBoxPainter.h

Index: Source/core/paint/SVGInlineFlowBoxPainter.h
diff --git a/Source/core/paint/SVGInlineFlowBoxPainter.h b/Source/core/paint/SVGInlineFlowBoxPainter.h
index 6bfd9c1039d217ae308c879ad8518f17952c8cc6..f9d6ec7d4d13d31a3f96f3f9f37c59e1a9253508 100644
--- a/Source/core/paint/SVGInlineFlowBoxPainter.h
+++ b/Source/core/paint/SVGInlineFlowBoxPainter.h
@@ -5,6 +5,8 @@
 #ifndef SVGInlineFlowBoxPainter_h
 #define SVGInlineFlowBoxPainter_h
 
+#include "wtf/Allocator.h"
+
 namespace blink {
 
 struct PaintInfo;
@@ -12,6 +14,7 @@ class LayoutPoint;
 class SVGInlineFlowBox;
 
 class SVGInlineFlowBoxPainter {
+    STACK_ALLOCATED();
 public:
     SVGInlineFlowBoxPainter(SVGInlineFlowBox& svgInlineFlowBox) : m_svgInlineFlowBox(svgInlineFlowBox) { }