Preserve canonical bit of static closures on reload.

runtime/vm/object_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/object.h"
 
 #include "vm/hash_table.h"
 #include "vm/isolate_reload.h"
 #include "vm/log.h"
 #include "vm/resolver.h"
@@ skipping 374 matching lines @@
     old_func ^= funcs.At(i);
     if (old_func.is_static() &&
       old_func.HasImplicitClosureFunction()) {
       selector = old_func.name();
       new_func = new_cls.LookupFunction(selector);
       if (!new_func.IsNull() && new_func.is_static()) {
         old_func = old_func.ImplicitClosureFunction();
         old_closure = old_func.ImplicitStaticClosure();
         new_func = new_func.ImplicitClosureFunction();
         new_closure = new_func.ImplicitStaticClosure();
+        if (old_closure.IsCanonical()) {
+          new_closure.SetCanonical();
+        }
         irc->AddBecomeMapping(old_closure, new_closure);
       }
     }
   }
 }
 
 
 class EnumClassConflict : public ClassReasonForCancelling {
  public:
   EnumClassConflict(Zone* zone, const Class& from, const Class& to)
@@ skipping 348 matching lines @@
       const Array& data_array =
           Array::Handle(zone, CachedEmptyICDataArray(num_args));
       set_ic_data_array(data_array);
     }
   }
 }
 
 #endif  // !PRODUCT
 
 }   // namespace dart.