Split playgrounds test into multiple test functions

Author: adrian-prantl

lldb/test/API/lang/swift/playgrounds/TestSwiftPlaygrounds.py

@@ -100,8 +100,7 @@ def test_concurrency(self):
     def test_import(self):
         """Test that a dylib can be imported in playgrounds"""
         self.launch(True)
-        self.do_concurrency_test()
-
+        self.do_import_test()
 
     def launch(self, force_target):
         """Test that playgrounds work"""