[lldb] Disable swift-specific tests when swift support is off

Author: felipepiovezan

lldb/test/API/lang/swift/async/formatters/task/TestSwiftTaskSyntheticProvider.py

@@ -6,6 +6,7 @@
 
 class TestCase(TestBase):
 
+    @swiftTest
     def test_top_level_task(self):
         """Test Task synthetic child provider for top-level Task."""
         self.build()
@@ -27,6 +28,7 @@ def test_top_level_task(self):
             ],
         )
 
+    @swiftTest
     def test_current_task(self):
         """Test Task synthetic child for UnsafeCurrentTask (from an async let)."""
         self.build()