TestDataFormatterStdVector.test_with_dsym_and_run_command marked XFAIL on Darwin

See http://llvm.org/bugs/show_bug.cgi?id=20264

llvm-svn: 212646

lldb/test/functionalities/data-formatter/data-formatter-stl/libstdcpp/vector/TestDataFormatterStdVector.py

@@ -14,6 +14,7 @@ class StdVectorDataFormatterTestCase(TestBase):
 
     @unittest2.skipUnless(sys.platform.startswith("darwin"), "requires Darwin")
     @dsym_test
+    @expectedFailureDarwin("llvm.org/pr20264")
     def test_with_dsym_and_run_command(self):
         """Test data formatter commands."""
         self.buildDsym()