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

Source/core/paint/SVGClipPainter.h

Index: Source/core/paint/SVGClipPainter.h
diff --git a/Source/core/paint/SVGClipPainter.h b/Source/core/paint/SVGClipPainter.h
index 5543bf7e546af96c373f75a1d563def7f54660df..5fb2b3afa3b5ed9482abbff3406df072e07df155 100644
--- a/Source/core/paint/SVGClipPainter.h
+++ b/Source/core/paint/SVGClipPainter.h
@@ -7,6 +7,7 @@
 
 #include "platform/geometry/FloatRect.h"
 #include "platform/graphics/paint/DisplayItemClient.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
@@ -15,6 +16,7 @@ class LayoutObject;
 class LayoutSVGResourceClipper;
 
 class SVGClipPainter {
+    STACK_ALLOCATED();
 public:
     enum ClipperState {
         ClipperNotApplied,