Add nsCycleCollector_shouldBeFreed calls for elements. b=385549 r+sr=jst

content/base/src/nsGenericElement.cpp

@@ -123,6 +123,7 @@
 
 #include "nsCycleCollectionParticipant.h"
 #include "nsCCUncollectableMarker.h"
+#include "nsCycleCollector.h"
 
 #ifdef MOZ_SVG
 PRBool NS_SVG_TestFeature(const nsAString &fstr);
@@ -1089,6 +1090,9 @@ nsGenericElement::~nsGenericElement()
 {
   NS_PRECONDITION(!IsInDoc(),
                   "Please remove this from the document properly");
+#ifdef DEBUG
+  nsCycleCollector_DEBUG_wasFreed(NS_STATIC_CAST(nsINode*, this));
+#endif
 }
 
 NS_IMETHODIMP
@@ -2104,6 +2108,9 @@ nsGenericElement::UnbindFromTree(PRBool aDeep, PRBool aNullParent)
   }
 
   nsNodeUtils::ParentChainChanged(this);
+#ifdef DEBUG
+  nsCycleCollector_DEBUG_shouldBeFreed(NS_STATIC_CAST(nsINode*, this));
+#endif
 }
 
 nsresult