Downgrade skip to xfail in TestBitfields on linux

the test should no longer crash, but we need to investigate why ToT clang still generates debug
info we don't understand.

llvm-svn: 268619

lldb/packages/Python/lldbsuite/test/lang/c/bitfields/TestBitfields.py

@@ -21,7 +21,7 @@ class BitfieldsTestCase(TestBase):
         self.line = line_number('main.c', '// Set break point at this line.')
 
     @skipIfWindows # BitFields exhibit crashes in record layout on Windows (http://llvm.org/pr21800)
-    @skipIf("llvm.org/pr27510", oslist=["linux"], compiler="clang", compiler_version=[">=", "3.9"]) # expectedFailure, skip to avoid crash
+    @expectedFailureAll("llvm.org/pr27510", oslist=["linux"], compiler="clang", compiler_version=[">=", "3.9"])
     def test_and_run_command(self):
         """Test 'frame variable ...' on a variable with bitfields."""
         self.build()