Rework standalone to use a synchronous loader that does not invoke Dart code

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 364 matching lines @@
       StartIsolateScope start_scope(I);
       Thread* T = Thread::Current();
       ASSERT(I == T->isolate());
       StackZone zone(T);
       HandleScope handle_scope(T);
       Error& error = Error::Handle(Z);
       error = T->sticky_error();
       if (!error.IsNull() && !error.IsUnwindError()) {
         OS::PrintErr("vm-service: Error: %s\n", error.ToErrorCString());
       }
+      error = I->sticky_error();
+      if (!error.IsNull() && !error.IsUnwindError()) {
+        OS::PrintErr("vm-service: Error: %s\n", error.ToErrorCString());
+      }
       Dart::RunShutdownCallback();
     }
     // Shut the isolate down.
     Dart::ShutdownIsolate(I);
     if (FLAG_trace_service) {
       OS::Print("vm-service: Shutdown.\n");
     }
     ServiceIsolate::FinishedExiting();
   }
 
@@ skipping 122 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