Issue #1402: PyInterpreterState_Clear() may still invoke user code

(in deallocation of running threads, for example), so the PyGILState_Release()
function must still be functional.
On the other hand, _PyGILState_Fini() only frees memory, and can be called later.

Backport candidate, but only after some experts comment on it.

Python/pythonrun.c

@@ -437,11 +437,6 @@ Py_Finalize(void)
 		_Py_PrintReferences(stderr);
 #endif /* Py_TRACE_REFS */
 
-	/* Cleanup auto-thread-state */
-#ifdef WITH_THREAD
-	_PyGILState_Fini();
-#endif /* WITH_THREAD */
-
 	/* Clear interpreter state */
 	PyInterpreterState_Clear(interp);
 
@@ -453,6 +448,11 @@ Py_Finalize(void)
 
 	_PyExc_Fini();
 
+	/* Cleanup auto-thread-state */
+#ifdef WITH_THREAD
+	_PyGILState_Fini();
+#endif /* WITH_THREAD */
+
 	/* Delete current thread */
 	PyThreadState_Swap(NULL);
 	PyInterpreterState_Delete(interp);