[d8] cleanly force exit in d8 on windows.

src/d8-windows.cc

Index: src/d8-windows.cc
diff --git a/src/d8-windows.cc b/src/d8-windows.cc
index ba89c4156fdf0daf8165c93bc78d97ebab9cc733..e7ddca694fcf4c9b345b9b006f2377f1854b6987 100644
--- a/src/d8-windows.cc
+++ b/src/d8-windows.cc
@@ -10,5 +10,12 @@ 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