- Ensure the Null class is recognized when writing snapshots.

runtime/vm/snapshot.cc

Index: runtime/vm/snapshot.cc
===================================================================
--- runtime/vm/snapshot.cc	(revision 34796)
+++ runtime/vm/snapshot.cc	(working copy)
@@ -32,12 +32,13 @@
 static bool IsObjectStoreClassId(intptr_t class_id) {
   // Check if this is a class which is stored in the object store.
   return (class_id == kObjectCid ||
-          (class_id >= kInstanceCid && class_id <= kInt32x4Cid) ||
+          (class_id >= kInstanceCid && class_id <= kFloat64x2Cid) ||
           class_id == kArrayCid ||
           class_id == kImmutableArrayCid ||
           RawObject::IsStringClassId(class_id) ||
           RawObject::IsTypedDataClassId(class_id) ||
-          RawObject::IsExternalTypedDataClassId(class_id));
+          RawObject::IsExternalTypedDataClassId(class_id) ||
+          class_id == kNullCid);
 }