Fix handle sharing bug in implementation of shape changes.

runtime/vm/isolate_reload.cc

 // Copyright (c) 2016, 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.
 
 #include "vm/isolate_reload.h"
 
 #include "vm/become.h"
 #include "vm/bit_vector.h"
 #include "vm/code_generator.h"
 #include "vm/compiler.h"
@@ skipping 30 matching lines @@
 #define I (isolate())
 #define Z (thread->zone())
 
 #define TIMELINE_SCOPE(name)                                                   \
     TimelineDurationScope tds##name(Thread::Current(),                         \
                                    Timeline::GetIsolateStream(),               \
                                    #name)
 
 
 InstanceMorpher::InstanceMorpher(Zone* zone, const Class& from, const Class& to)
-  : from_(from), to_(to), mapping_(zone, 0) {
+    : from_(Class::Handle(zone, from.raw())),
+      to_(Class::Handle(zone, to.raw())),
+      mapping_(zone, 0) {
   ComputeMapping();
   before_ = new(zone) ZoneGrowableArray<const Instance*>(zone, 0);
   after_ = new(zone) ZoneGrowableArray<const Instance*>(zone, 0);
   ASSERT(from_.id() == to_.id());
   cid_ = from_.id();
 }
 
 
 void InstanceMorpher::AddObject(RawObject* object) const {
   ASSERT(object->GetClassId() == cid());
@@ skipping 1604 matching lines @@
         ASSERT(!super_cls.IsNull());
         super_cls.AddDirectSubclass(cls);
       }
     }
   }
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart