Add a VM defined class MirrorReference as an opaque pointer for Dart code to VM internal objects.

runtime/vm/object_store.h

 // 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_OBJECT_STORE_H_
 #define VM_OBJECT_STORE_H_
 
 #include "vm/object.h"
 
 namespace dart {
@@ skipping 224 matching lines @@
     return OFFSET_OF(ObjectStore, jsregexp_class_);
   }
 
   RawClass* weak_property_class() const {
     return weak_property_class_;
   }
   void set_weak_property_class(const Class& value) {
     weak_property_class_ = value.raw();
   }
 
+  RawClass* mirror_reference_class() const {
+    return mirror_reference_class_;
+  }
+  void set_mirror_reference_class(const Class& value) {
+    mirror_reference_class_ = value.raw();
+  }
+
   RawArray* symbol_table() const { return symbol_table_; }
   void set_symbol_table(const Array& value) { symbol_table_ = value.raw(); }
 
   RawArray* canonical_type_arguments() const {
     return canonical_type_arguments_;
   }
   void set_canonical_type_arguments(const Array& value) {
     canonical_type_arguments_ = value.raw();
   }
 
@@ skipping 184 matching lines @@
   RawClass* array_class_;
   RawType* array_type_;
   RawClass* immutable_array_class_;
   RawClass* growable_object_array_class_;
   RawClass* float32x4_class_;
   RawClass* uint32x4_class_;
   RawArray* typed_data_classes_;
   RawClass* stacktrace_class_;
   RawClass* jsregexp_class_;
   RawClass* weak_property_class_;
+  RawClass* mirror_reference_class_;
   RawArray* symbol_table_;
   RawArray* canonical_type_arguments_;
   RawLibrary* async_library_;
   RawLibrary* builtin_library_;
   RawLibrary* core_library_;
   RawLibrary* collection_library_;
   RawLibrary* collection_dev_library_;
   RawLibrary* isolate_library_;
   RawLibrary* json_library_;
   RawLibrary* math_library_;
@@ skipping 17 matching lines @@
   RawObject** to() { return reinterpret_cast<RawObject**>(&keyword_symbols_); }
 
   friend class SnapshotReader;
 
   DISALLOW_COPY_AND_ASSIGN(ObjectStore);
 };
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_STORE_H_