Implement patch records to patch canonical objects.

runtime/vm/object.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_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 256 matching lines @@
     raw()->SetCreatedFromSnapshot();
   }
   bool IsCanonical() const {
     ASSERT(!IsNull());
     return raw()->IsCanonical();
   }
   void SetCanonical() const {
     ASSERT(!IsNull());
     raw()->SetCanonical();
   }
+  void ClearCanonical() const {
+    ASSERT(!IsNull());
+    raw()->ClearCanonical();
+  }
   intptr_t GetClassId() const {
     return !raw()->IsHeapObject() ?
         static_cast<intptr_t>(kSmiCid) : raw()->GetClassId();
   }
   inline RawClass* clazz() const;
   static intptr_t tags_offset() { return OFFSET_OF(RawObject, tags_); }
 
   // Class testers.
 #define DEFINE_CLASS_TESTER(clazz)                                             \
   virtual bool Is##clazz() const { return false; }
@@ skipping 7725 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_