Do not Dart_RunLoop if --load_async=false. This allows the program to run to the end with --pause-i…

runtime/bin/main.cc

 // Copyright (c) 2012, 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 <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 
 #include "include/dart_api.h"
 #include "include/dart_debugger_api.h"
@@ skipping 529 matching lines @@
   // closures and setting up 'package root' for URI resolution.
   result = DartUtils::PrepareForScriptLoading(package_root, builtin_lib);
   CHECK_RESULT(result);
 
   IsolateData* isolate_data = reinterpret_cast<IsolateData*>(data);
   ASSERT(isolate_data != NULL);
   ASSERT(isolate_data->script_url != NULL);
   result = DartUtils::LoadScript(isolate_data->script_url, builtin_lib);
   CHECK_RESULT(result);
 
-  result = Dart_RunLoop();
-  CHECK_RESULT(result);
+  if (Dart_IsVMFlagSet("load_async")) {
+    result = Dart_RunLoop();
+    CHECK_RESULT(result);
+  }
 
   Platform::SetPackageRoot(package_root);
   Dart_Handle io_lib_url = DartUtils::NewString(DartUtils::kIOLibURL);
   CHECK_RESULT(io_lib_url);
   Dart_Handle io_lib = Dart_LookupLibrary(io_lib_url);
   CHECK_RESULT(io_lib);
   Dart_Handle platform_type = DartUtils::GetDartType(DartUtils::kIOLibURL,
                                                      "Platform");
   CHECK_RESULT(platform_type);
   Dart_Handle script_name = DartUtils::NewString("_nativeScript");
@@ skipping 565 matching lines @@
   exit(Process::GlobalExitCode());
 }
 
 }  // namespace bin
 }  // namespace dart
 
 int main(int argc, char** argv) {
   dart::bin::main(argc, argv);
   UNREACHABLE();
 }