Make Dart test scripts work for the VM on Windows.

tools/testing/dart/test_runner.dart

 // Copyright (c) 2011, 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.
 
 #library("test_runner");
 
 #import("status_file_parser.dart");
 #import("test_progress.dart");
 
 /**
@@ skipping 53 matching lines @@
     testCase.output = this;
   }
 
   String get result() =>
       hasCrashed ? CRASH : (hasTimedOut ? TIMEOUT : (hasFailed ? FAIL : PASS));
 
   bool get unexpectedOutput() => !testCase.expectedOutcomes.contains(result);
   
   // The Java dartc runner exits with code 253 in case of unhandles
   // exceptions.
-  bool get hasCrashed() =>
-      !timedOut && (exitCode != -1) && ((exitCode < 0) || (exitCode == 253));
+  // The VM uses std::abort to terminate on asserts.
+  // std::abort terminates with exit code 3 on Windows.
+  bool get hasCrashed() {
+    if (new Platform().operatingSystem() == 'windows') {
+      if (exitCode == 3) {
+        return !timedOut;
+      }
+      return (!timedOut &&
+              (exitCode != -1) &&
+              (exitCode < 0) &&
+              ((0x3FFFFF00 & exitCode) == 0));
+    }
+    return (!timedOut &&
+            (exitCode != -1) &&
+            ((exitCode < 0) || (exitCode == 253)));
+  }
 
   bool get hasTimedOut() => timedOut;
 
   bool get didFail() => exitCode != 0 && !hasCrashed;
 
   // Reverse result of a negative test.
   bool get hasFailed() => (testCase.isNegative ? !didFail : didFail);
 }
 
 
@@ skipping 92 matching lines @@
       numProcesses++;
     }
   }
 
   runTest(TestCase test) {
     progress.testAdded();
     tests.add(test);
     tryRunTest();
   }
 }