[lldb] Disable new TestLocationListLookup when clang version is <= 11 (#75102)

The newly introduced LocationListLookupTestCase.test_loclist_expr test
fails with older clangs.

Author: augusto2112

lldb/test/API/functionalities/location-list-lookup/TestLocationListLookup.py

@@ -43,6 +43,7 @@ def test_loclist_frame_var(self):
         self.build()
         self.check_local_vars(self.launch(), check_expr=False)
 
+    @skipIf(compiler="clang", compiler_version=["<=", "11.0"])
     @skipUnlessDarwin
     def test_loclist_expr(self):
         self.build()