Oilpan: move node/element rare data objects to the heap.

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index f05dbc32bdab02d2bc001f22e16170b7ab3472c8..5a642d590ced25d8b3b2e996c24eb5d0dbe57c98 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -591,8 +591,10 @@ Document::~Document()
 
     // We must call clearRareData() here since a Document class inherits TreeScope
     // as well as Node. See a comment on TreeScope.h for the reason.
+#if !ENABLE(OILPAN)
     if (hasRareData())
         clearRareData();
+#endif
 
     ASSERT(!m_listsInvalidatedAtDocument.size());