GH-90699: fix ref counting of static immortal strings (gh-94850)

Misc/NEWS.d/next/Core and Builtins/2022-07-14-10-07-53.gh-issue-90699.x3aG9m.rst

+Fix reference counting bug in :meth:`bool.__repr__`. Patch by Kumar Aditya.

Modules/_io/textio.c

@@ -2244,7 +2244,7 @@ _textiowrapper_readline(textio *self, Py_ssize_t limit)
         Py_CLEAR(chunks);
     }
     if (line == NULL) {
-        line = &_Py_STR(empty);
+        line = Py_NewRef(&_Py_STR(empty));
     }
 
     return line;

Objects/boolobject.c

@@ -9,7 +9,8 @@
 static PyObject *
 bool_repr(PyObject *self)
 {
-    return self == Py_True ? &_Py_ID(True) : &_Py_ID(False);
+    PyObject *res = self == Py_True ? &_Py_ID(True) : &_Py_ID(False);
+    return Py_NewRef(res);
 }
 
 /* Function to return a bool from a C long */