tools/runtests.py: Fix cctests on Windows; properly return error code when there were Python except…

test/cctest/testcfg.py

 # Copyright 2008 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
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 27 matching lines @@
 
   def __init__(self, name, root):
     super(CcTestSuite, self).__init__(name, root)
     self.serdes_dir = os.path.normpath(
         os.path.join(root, "..", "..", "out", ".serdes"))
     if os.path.exists(self.serdes_dir):
       shutil.rmtree(self.serdes_dir, True)
     os.makedirs(self.serdes_dir)
 
   def ListTests(self, context):
+    shell = os.path.abspath(os.path.join(context.shell_dir, self.shell()))
     if utils.IsWindows():
       shell += '.exe'
-    shell = os.path.abspath(os.path.join(context.shell_dir, self.shell()))
     output = commands.Execute([context.command_prefix,
                                shell,
                                '--list',
                                context.extra_flags])
     if output.exit_code != 0:
       print output.stdout
       print output.stderr
       return []
     tests = []
     for test_desc in output.stdout.strip().split():
@@ skipping 110 matching lines @@
     return result
 
   def GetTestStatus(self, sections, defs):
     status_file = join(self.root, 'cctest.status')
     if exists(status_file):
       test.ReadConfigurationInto(status_file, sections, defs)
 
 
 def GetConfiguration(context, root):
   return CcTestConfiguration(context, root)