bpo-43588: use static variable module under building Python with --with-experimental-isolated-subinterpreters cause crash.

[JunyiXie]

use static module variable under building Python with --with-experimental-isolated-subinterpreters cause crash.

compiler_mod(struct compiler *c, mod_ty mod)
{
    PyCodeObject *co;
    int addNone = 1;
    static PyObject *module;
    if (!module) {
        module = PyUnicode_InternFromString("<module>");
        if (!module)
            return NULL;
    }
...
}

https://bugs.python.org/issue43588

[JunyiXie]

Hello, this change seems might not need to update news.

[github-actions]

This PR is stale because it has been open for 30 days with no activity.

[kumaraditya303]

The static variable was removed in #31366 so closing.