Refactor how we report reload results

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 369 matching lines @@
 
 class EnsureFinalizedError : public ClassReasonForCancelling {
  public:
   EnsureFinalizedError(const Class& from, const Class& to, const Error& error)
       : ClassReasonForCancelling(from, to), error_(error) { }
 
  private:
   const Error& error_;
 
   RawError* ToError() { return error_.raw(); }
+
+  RawString* ToString() {
+    return String::New(error_.ToErrorCString());
+  }
 };
 
 
 class NativeFieldsConflict : public ClassReasonForCancelling {
  public:
   NativeFieldsConflict(const Class& from, const Class& to)
       : ClassReasonForCancelling(from, to) { }
 
  private:
   RawString* ToString() {
@@ skipping 291 matching lines @@
     }
     ClearAndSetStaticTarget(new_target);
   } else {
     ClearWithSentinel();
   }
 }
 
 #endif  // !PRODUCT
 
 }   // namespace dart.