Issue #17645: convert an assert() into a proper exception in _Py_Mangle().

Python/compile.c

@@ -221,8 +221,11 @@ _Py_Mangle(PyObject *privateobj, PyObject *ident)
     }
     plen = strlen(p);
 
-    assert(1 <= PY_SSIZE_T_MAX - nlen);
-    assert(1 + nlen <= PY_SSIZE_T_MAX - plen);
+    if (plen + nlen >= PY_SSIZE_T_MAX - 1) {
+        PyErr_SetString(PyExc_OverflowError,
+                        "private identifier too large to be mangled");
+        return NULL;
+    }
 
     ident = PyString_FromStringAndSize(NULL, 1 + nlen + plen);
     if (!ident)