iPhone 5c marketing site repaints incorrectly with layer squashing

Source/platform/geometry/IntRect.cpp

 /*
  * Copyright (C) 2003, 2006, 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 155 matching lines @@
 
     size_t count = rects.size();
     for (size_t i = 0; i < count; ++i)
         result.unite(rects[i]);
 
     return result;
 }
 
 #ifndef NDEBUG
     // Prints the rect to the screen.
-void IntRect::show()
+void IntRect::show() const
 {
     LayoutRect(*this).show();
 }
 #endif
 
 } // namespace WebCore