Treat null like the object it is in the Observatory and Service.

runtime/vm/raw_object.h

Index: runtime/vm/raw_object.h
diff --git a/runtime/vm/raw_object.h b/runtime/vm/raw_object.h
index ebd0f2d311bf7d628aa84b3aba652106e9851a62..631630bf8d8c0815598941d645ac0f1e9dd0d55b 100644
--- a/runtime/vm/raw_object.h
+++ b/runtime/vm/raw_object.h
@@ -377,6 +377,9 @@ class RawObject {
     ptr()->tags_ = RememberedBit::update(false, tags);
   }
 
+  bool IsNullOrPseudoNull() {
+    return (!IsHeapObject() && (GetClassId() == kNullCid));
+  }

[turnidge, 2014/08/27 16:13:56]

I missed where this is used... can you tell me?

[rmacnak, 2014/08/27 18:09:59]

Was used in guard for values not to insert in the ring. Removed based on
narrowed restriction..

   bool IsDartInstance() {
     return (!IsHeapObject() || (GetClassId() >= kInstanceCid));
   }