Rehash canonical constants table for each class that can be affected by the 'become' operation

runtime/vm/isolate_reload.h

 // 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.
 
 #ifndef RUNTIME_VM_ISOLATE_RELOAD_H_
 #define RUNTIME_VM_ISOLATE_RELOAD_H_
 
 #include "include/dart_tools_api.h"
 
 #include "vm/hash_map.h"
@@ skipping 229 matching lines @@
   void RollbackLibraries();
 
 #ifdef DEBUG
   void VerifyMaps();
 #endif
 
   void Commit();
 
   void PostCommit();
 
+  void RehashConstants();
+
   void ClearReplacedObjectBits();
 
   // atomic_install:
   void MarkAllFunctionsForRecompilation();
   void ResetUnoptimizedICsOnStack();
   void ResetMegamorphicCaches();
   void InvalidateWorld();
 
   // The zone used for all reload related allocations.
   Zone* zone_;
@@ skipping 78 matching lines @@
   friend class ObjectLocator;
   friend class MarkFunctionsForRecompilation;  // IsDirty.
   friend class ReasonForCancelling;
 
   static Dart_FileModifiedCallback file_modified_callback_;
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_ISOLATE_RELOAD_H_