[test] Skip a test which sporadically fails in its dsym variant

There is a mailing list discussion re: r325927 about why this test fails
in the dsym variant. I've marked it skipped for now, until the issue is
resolved.

llvm-svn: 327089

lldb/packages/Python/lldbsuite/test/lang/c/unicode/TestUnicodeSymbols.py

@@ -2,12 +2,14 @@
 import lldb
 from lldbsuite.test.lldbtest import *
 import lldbsuite.test.lldbutil as lldbutil
+from lldbsuite.test.decorators import *
 
 
 class TestUnicodeSymbols(TestBase):
 
     mydir = TestBase.compute_mydir(__file__)
 
+    @skipIf(debug_info=["dsym"])
     def test_union_members(self):
         self.build()
         spec = lldb.SBModuleSpec()