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

Source/core/layout/LayoutTable.h

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2009, 2010 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 109 matching lines @@
     }
 
     int calcBorderStart() const;
     int calcBorderEnd() const;
     void recalcBordersInRowDirection();
 
     void addChild(LayoutObject* child, LayoutObject* beforeChild = nullptr) override;
     void addChildIgnoringContinuation(LayoutObject* newChild, LayoutObject* beforeChild = nullptr) override;
 
     struct ColumnStruct {
+        ALLOW_ONLY_INLINE_ALLOCATION();
         explicit ColumnStruct(unsigned initialSpan = 1)
             : span(initialSpan)
         {
         }
 
         unsigned span;
     };
 
     void forceSectionsRecalc()
     {
@@ skipping 226 matching lines @@
     if (m_firstBody)
         return m_firstBody;
     return m_foot;
 }
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutTable, isTable());
 
 } // namespace blink
 
 #endif // LayoutTable_h