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

Source/core/paint/InlineTextBoxPainter.h

Index: Source/core/paint/InlineTextBoxPainter.h
diff --git a/Source/core/paint/InlineTextBoxPainter.h b/Source/core/paint/InlineTextBoxPainter.h
index 33104bd56cafdd6d6ca081403dca5093a7143fe8..3974a72d5afd72b8e9ec48b5d426acfd0584a327 100644
--- a/Source/core/paint/InlineTextBoxPainter.h
+++ b/Source/core/paint/InlineTextBoxPainter.h
@@ -7,6 +7,7 @@
 
 #include "core/style/ComputedStyleConstants.h"
 #include "platform/geometry/LayoutRect.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
@@ -25,6 +26,7 @@ class LayoutPoint;
 class LayoutTextCombine;
 
 class InlineTextBoxPainter {
+    STACK_ALLOCATED();
 public:
     InlineTextBoxPainter(InlineTextBox& inlineTextBox) : m_inlineTextBox(inlineTextBox) { }