Revert "Hack around TLS destructors firing after the process exits"

runtime/bin/run_vm_tests.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 <stdio.h>
 
 #include "bin/file.h"
-#include "bin/dartutils.h"
-#include "bin/platform.h"
 
 #include "vm/benchmark_test.h"
 #include "vm/dart.h"
+#include "bin/dartutils.h"
 #include "vm/unit_test.h"
 
 
 // TODO(iposva, asiva): This is a placeholder for the real unittest framework.
 namespace dart {
 
 // vm_isolate_snapshot_buffer points to a snapshot for the vm isolate if we
 // link in a snapshot otherwise it is initialized to NULL.
 extern const uint8_t* bin::vm_isolate_snapshot_buffer;
 
@@ skipping 104 matching lines @@
     fprintf(stderr, "No tests matched: %s\n", run_filter);
     return 1;
   }
   return 0;
 }
 
 }  // namespace dart
 
 
 int main(int argc, const char** argv) {
-  dart::bin::Platform::Exit(dart::Main(argc, argv));
+  return dart::Main(argc, argv);
 }