[d8] cleanly force exit in d8 on windows.

src/d8-windows.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/d8.h"
 
 
 namespace v8 {
 
 
 void Shell::AddOSMethods(Isolate* isolate, Local<ObjectTemplate> os_templ) {}
 
+void Shell::Exit(int exit_code) {
+  // Use TerminateProcess avoid races between isolate threads and
+  // static destructors.
+  fflush(stdout);
+  fflush(stderr);
+  TerminateProcess(GetCurrentProcess(), exit_code);
+}
 
 }  // namespace v8