lit: remove python2-isms

Summary:
`assert.assertItemEqual` went away in Python 3. Seeing how lists
are ordered, comparing a list against each other should work just
as well.

Patch by @jbergstroem (Johan Bergström).

Reviewers: modocache, gparker42

Reviewed By: modocache

Differential Revision: https://reviews.llvm.org/D31229

llvm-svn: 298479

llvm/utils/lit/tests/unit/TestRunner.py

@@ -89,7 +89,7 @@ def test_lists(self):
         parsers = self.make_parsers()
         self.parse_test(parsers)
         list_parser = self.get_parser(parsers, 'MY_LIST:')
-        self.assertItemsEqual(list_parser.getValue(),
+        self.assertEqual(list_parser.getValue(),
                               ['one', 'two', 'three', 'four'])
 
     def test_commands(self):
@@ -106,7 +106,7 @@ def test_custom(self):
         self.parse_test(parsers)
         custom_parser = self.get_parser(parsers, 'MY_CUSTOM:')
         value = custom_parser.getValue()
-        self.assertItemsEqual(value, ['a', 'b', 'c'])
+        self.assertEqual(value, ['a', 'b', 'c'])
 
     def test_bad_keywords(self):
         def custom_parse(line_number, line, output):