VM restart + shutdown fixes

runtime/vm/service_isolate.cc

 // Copyright (c) 2015, 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/service_isolate.h"
 
 #include "vm/compiler.h"
 #include "vm/dart_api_impl.h"
 #include "vm/dart_entry.h"
 #include "vm/isolate.h"
@@ skipping 418 matching lines @@
 
 
 void ServiceIsolate::KillServiceIsolate() {
   if (!FLAG_shutdown) {
     return;
   }
   {
     MonitorLocker ml(monitor_);
     shutting_down_ = true;
   }
-  Isolate::KillIfExists(isolate_);
+  Isolate::KillIfExists(isolate_, Isolate::kInternalKillMsg);
   {
     MonitorLocker ml(monitor_);
     while (shutting_down_) {
       ml.Wait();
     }
   }
 }
 
 
 void ServiceIsolate::Shutdown() {
@@ skipping 36 matching lines @@
   ASSERT(!result.IsNull());
   Dart_Port port = ILLEGAL_PORT;
   if (result.IsReceivePort()) {
     port = ReceivePort::Cast(result).Id();
   }
   ASSERT(port != ILLEGAL_PORT);
   ServiceIsolate::SetServicePort(port);
 }
 
 }  // namespace dart