Unify class ids and snapshot object ids list so that we don't have disparate and sometimes confusin…

vm/snapshot_ids.h

Index: vm/snapshot_ids.h
===================================================================
--- vm/snapshot_ids.h	(revision 0)
+++ vm/snapshot_ids.h	(revision 0)
@@ -0,0 +1,43 @@
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#ifndef VM_SNAPSHOT_IDS_H_
+#define VM_SNAPSHOT_IDS_H_
+
+#include "vm/raw_object.h"
+
+namespace dart {
+
+// Index for predefined singleton objects used in a snapshot.
+enum {
+  kNullObject = 0,
+  kSentinelObject,
+  kTrueValue,
+  kFalseValue,
+  kClassIdsOffset = kFalseValue,
+
+  // The class ids of predefined classes are included in this list
+  // at an offset of kClassIdsOffset.
+
+  kObjectType = (kNumPredefinedCids + kClassIdsOffset),
+  kNullType,
+  kDynamicType,
+  kVoidType,
+  kFunctionInterface,
+  kNumberInterface,
+  kDoubleInterface,
+  kIntInterface,
+  kBoolInterface,
+  kStringInterface,
+  kListInterface,
+  kByteArrayInterface,
+
+  kInstanceObjectId,
+  kMaxPredefinedObjectIds,
+  kInvalidIndex = -1,
+};
+
+}  // namespace dart
+
+#endif  // VM_SNAPSHOT_IDS_H_