'make quickcheck': Assorted improvements.

tools/run-tests.py

 #!/usr/bin/env python
 #
 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 311 matching lines @@
     suite = testsuite.TestSuite.LoadTestSuite(
         os.path.join(workspace, "test", root))
     if suite:
       suites.append(suite)
 
   if options.download_data:
     for s in suites:
       s.DownloadData()
 
   for (arch, mode) in options.arch_and_mode:
-    code = Execute(arch, mode, args, options, suites, workspace)
+    try:
+      code = Execute(arch, mode, args, options, suites, workspace)
+    except KeyboardInterrupt:
+      return 2
     exit_code = exit_code or code
   return exit_code
 
 
 def Execute(arch, mode, args, options, suites, workspace):
   print(">>> Running tests for %s.%s" % (arch, mode))
 
   shell_dir = options.shell_dir
   if not shell_dir:
     if options.buildbot:
@@ skipping 99 matching lines @@
       runner = network_execution.NetworkedRunner(suites, progress_indicator,
                                                  ctx, peers, workspace)
     else:
       runner = execution.Runner(suites, progress_indicator, ctx)
 
     exit_code = runner.Run(options.j)
     if runner.terminate:
       return exit_code
     overall_duration = time.time() - start_time
   except KeyboardInterrupt:
-    return 1
+    raise
 
   if options.time:
     verbose.PrintTestDurations(suites, overall_duration)
   return exit_code
 
 
 if __name__ == "__main__":
   sys.exit(Main())