bpo-45061: Detect refcount bug on empty tuple singleton (GH-28503)

Detect refcount bugs in C extensions when the empty tuple singleton
is destroyed by mistake.

Add the _Py_FatalRefcountErrorFunc() function.

Python/pylifecycle.c

@@ -2805,6 +2805,16 @@ _Py_FatalErrorFormat(const char *func, const char *format, ...)
 }
 
 
+void _Py_NO_RETURN
+_Py_FatalRefcountErrorFunc(const char *func, const char *msg)
+{
+    _Py_FatalErrorFormat(func,
+                         "%s: bug likely caused by a refcount error "
+                         "in a C extension",
+                         msg);
+}
+
+
 void _Py_NO_RETURN
 Py_ExitStatusException(PyStatus status)
 {