[test] Fix deterministic test shards.

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 40 matching lines @@
                               [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():
       test = testcase.TestCase(self, test_desc)
       tests.append(test)
-    tests.sort()
+    tests.sort(key=lambda t: t.path)
     return tests
 
   def GetFlagsForTestCase(self, testcase, context):
     testname = testcase.path.split(os.path.sep)[-1]
     return (testcase.flags + [testcase.path] + context.mode_flags)
 
   def shell(self):
     return "cctest"
 
 
 def GetSuite(name, root):
   return CcTestSuite(name, root)