bpo-30860: Fix a refleak. (#3506)

* Drop warnoptions from PyInterpreterState.

* Drop xoptions from PyInterpreterState.

* Don't set warnoptions and _xoptions again.

* Decref after adding to sys.__dict__.

* Drop an unused macro.

* Check sys.xoptions *before* we delete it.

Python/pythonrun.c

@@ -113,7 +113,10 @@ PyRun_InteractiveLoopFlags(FILE *fp, const char *filename_str, PyCompilerFlags *
     err = -1;
     for (;;) {
         ret = PyRun_InteractiveOneObject(fp, filename, flags);
-        _PY_DEBUG_PRINT_TOTAL_REFS();
+#ifdef Py_REF_DEBUG
+        if (_PyDebug_XOptionShowRefCount() == Py_True)
+            _PyDebug_PrintTotalRefs();
+#endif
         if (ret == E_EOF) {
             err = 0;
             break;