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

Source/core/paint/SVGInlineTextBoxPainter.h

Index: Source/core/paint/SVGInlineTextBoxPainter.h
diff --git a/Source/core/paint/SVGInlineTextBoxPainter.h b/Source/core/paint/SVGInlineTextBoxPainter.h
index 84ef666c35a5a0a12cf4329fb608293d06fbc7bd..b898e1a800b60ce98a08826577eae600b397fe26 100644
--- a/Source/core/paint/SVGInlineTextBoxPainter.h
+++ b/Source/core/paint/SVGInlineTextBoxPainter.h
@@ -7,6 +7,7 @@
 
 #include "core/style/ComputedStyleConstants.h"
 #include "core/layout/svg/LayoutSVGResourcePaintServer.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
@@ -22,6 +23,7 @@ class TextRun;
 class DocumentMarker;
 
 class SVGInlineTextBoxPainter {
+    STACK_ALLOCATED();
 public:
     SVGInlineTextBoxPainter(SVGInlineTextBox& svgInlineTextBox) : m_svgInlineTextBox(svgInlineTextBox) { }
     void paint(const PaintInfo&, const LayoutPoint&);