[lldb/Test] Fix replay with TestSetWatchpoint.py

The reproducers only track the creation of objects and not their
destruction. Therefore it keeps all objects alive indefinitely.

lldb/test/API/python_api/watchpoint/TestSetWatchpoint.py

@@ -103,4 +103,9 @@ class SetWatchpointAPITestCase(TestBase):
             PROCESS_EXITED)
 
         self.dbg.DeleteTarget(target)
-        self.assertFalse(watchpoint.IsValid())
+
+        # The next check relies on the watchpoint being destructed, which does
+        # not happen during replay because objects are intentionally kept alive
+        # forever.
+        if not configuration.is_reproducer():
+            self.assertFalse(watchpoint.IsValid())