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

Source/core/paint/ReplacedPainter.h

Index: Source/core/paint/ReplacedPainter.h
diff --git a/Source/core/paint/ReplacedPainter.h b/Source/core/paint/ReplacedPainter.h
index ed7a76ce21bda010618af44feef494a891329cb5..d03140f1b15d78c7f7157f18f5577033631623b0 100644
--- a/Source/core/paint/ReplacedPainter.h
+++ b/Source/core/paint/ReplacedPainter.h
@@ -5,6 +5,8 @@
 #ifndef ReplacedPainter_h
 #define ReplacedPainter_h
 
+#include "wtf/Allocator.h"
+
 namespace blink {
 
 struct PaintInfo;
@@ -12,6 +14,7 @@ class LayoutPoint;
 class LayoutReplaced;
 
 class ReplacedPainter {
+    STACK_ALLOCATED();
 public:
     ReplacedPainter(LayoutReplaced& layoutReplaced) : m_layoutReplaced(layoutReplaced) { }