Start accepting incoming sockets earlier on Windows, to associate a at AcceptEx error to 'ServerSoc…

runtime/bin/main.cc

Index: runtime/bin/main.cc
diff --git a/runtime/bin/main.cc b/runtime/bin/main.cc
index 2c0047ab2383adc721049198a7be2c621ec5e328..abcb484f1b731cffc20992c2b41414c853e1887c 100644
--- a/runtime/bin/main.cc
+++ b/runtime/bin/main.cc
@@ -1008,6 +1008,9 @@ void main(int argc, char** argv) {
     exit(kErrorExitCode);
   }
 
+  // Start event handler.
+  EventHandler::Start();
+
   // Start the debugger wire protocol handler if necessary.
   if (start_debugger) {
     ASSERT(debug_port >= 0);
@@ -1018,9 +1021,6 @@ void main(int argc, char** argv) {
     }
   }
 
-  // Start event handler.
-  EventHandler::Start();
-
   ASSERT(Dart_CurrentIsolate() == NULL);
   // Start the VM service isolate, if necessary.
   if (start_vm_service) {