Move element flags from ElementRareData to NodeRareData

Source/core/dom/NodeRareData.cpp

Index: Source/core/dom/NodeRareData.cpp
diff --git a/Source/core/dom/NodeRareData.cpp b/Source/core/dom/NodeRareData.cpp
index 82717cb2afe01dc784acaa3294f96439ec904065..b5e31865c12efa35d53dc17d9c91622271283f02 100644
--- a/Source/core/dom/NodeRareData.cpp
+++ b/Source/core/dom/NodeRareData.cpp
@@ -30,12 +30,13 @@
 
 #include "config.h"
 #include "core/dom/NodeRareData.h"
+#include "core/dom/Element.h"
 
 namespace WebCore {
 
 struct SameSizeAsNodeRareData {
-    unsigned m_bitfields : 20;
     void* m_pointer[3];
+    unsigned m_bitfields;
 };
 
 COMPILE_ASSERT(sizeof(NodeRareData) == sizeof(SameSizeAsNodeRareData), NodeRareDataShouldStaySmall);
@@ -54,5 +55,10 @@ void NodeListsNodeData::invalidateCaches(const QualifiedName* attrName)
         it->value->invalidateCache();
 }
 
+// Ensure the 10 bits reserved for the m_connectedFrameCount cannot overflow
+COMPILE_ASSERT(Page::maxNumberOfFrames < (1 << NodeRareData::ConnectedFrameCountBits), Frame_limit_should_fit_in_rare_data_count);
+
+// Ensure all element flags fit in NodeRareData::m_elementFlags.
+COMPILE_ASSERT(static_cast<unsigned>(NumberOfElementFlags) == static_cast<unsigned>(NodeRareData::ElementFlagsBits), Element_flags_should_fit_in_node_rare_data);
 
 } // namespace WebCore