Fix build

runtime/vm/debugger_api_impl.cc

 // Copyright (c) 2012, 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 "include/dart_debugger_api.h"
 
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
 #include "vm/dart_api_impl.h"
 #include "vm/dart_api_state.h"
@@ skipping 960 matching lines @@
                          CURRENT_FUNC, library_id);
   }
   lib.set_debuggable(is_debuggable);
   return Api::Success();
 }
 
 
 DART_EXPORT Dart_Isolate Dart_GetIsolate(Dart_IsolateId isolate_id) {
   // Dart_Isolate is now the same as Dart_IsolateId.
   // TODO(johnmccutchan): Kill Dart_IsolateId.
-  return reinterpret_cast<Dart_Isolate>(isolate_id);
+  return static_cast<Dart_Isolate>(isolate_id);
 }
 
 
 DART_EXPORT Dart_IsolateId Dart_GetIsolateId(Dart_Isolate dart_isolate) {
   // Dart_Isolate is now the same as Dart_IsolateId.
   // TODO(johnmccutchan): Kill Dart_IsolateId.
-  return reinterpret_cast<Dart_IsolateId>(dart_isolate);
+  return static_cast<Dart_IsolateId>(dart_isolate);
 }
 
 }  // namespace dart