Fix for heap corruption issue when patch https://codereview.chromium.org/2225243003/ is applied.

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 VM_ISOLATE_RELOAD_H_
 #define VM_ISOLATE_RELOAD_H_
 
 #include "include/dart_tools_api.h"
 
 #include "vm/hash_map.h"
@@ skipping 99 matching lines @@
   // Append the reason to JSON array.
   virtual void AppendTo(JSONArray* array);
 
   // Concrete subclasses must override either ToError or ToString.
 };
 
 
 // Abstract class for also capturing the from_ and to_ class.
 class ClassReasonForCancelling : public ReasonForCancelling {
  public:
-  ClassReasonForCancelling(Zone* zone, const Class& from, const Class& to)
-      : ReasonForCancelling(zone), from_(from), to_(to) { }
-
+  ClassReasonForCancelling(Zone* zone, const Class& from, const Class& to);
   void AppendTo(JSONArray* array);
 
  protected:
   const Class& from_;
   const Class& to_;
 };
 
 
 class IsolateReloadContext {
  public:
@@ skipping 211 matching lines @@
   friend class ObjectLocator;
   friend class MarkFunctionsForRecompilation;  // IsDirty.
   friend class ReasonForCancelling;
 
   static Dart_FileModifiedCallback file_modified_callback_;
 };
 
 }  // namespace dart
 
 #endif   // VM_ISOLATE_RELOAD_H_