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

Source/core/paint/ReplicaPainter.h

Index: Source/core/paint/ReplicaPainter.h
diff --git a/Source/core/paint/ReplicaPainter.h b/Source/core/paint/ReplicaPainter.h
index c5b377c898fd40aa1a01d723a8081ae817be66c3..25799efd8e857044ba8a87e5a1c9a356cebf534c 100644
--- a/Source/core/paint/ReplicaPainter.h
+++ b/Source/core/paint/ReplicaPainter.h
@@ -5,6 +5,8 @@
 #ifndef ReplicaPainter_h
 #define ReplicaPainter_h
 
+#include "wtf/Allocator.h"
+
 namespace blink {
 
 struct PaintInfo;
@@ -12,6 +14,7 @@ class LayoutPoint;
 class LayoutReplica;
 
 class ReplicaPainter {
+    STACK_ALLOCATED();
 public:
     ReplicaPainter(LayoutReplica& layoutReplica) : m_layoutReplica(layoutReplica) { }