gh-122759: Remove assert from RERAISE error handling (#122760)

Author: sobolevn

Python/bytecodes.c

@@ -1183,7 +1183,6 @@ dummy_func(
                     assert(!_PyErr_Occurred(tstate));
                 }
                 else {
-                    assert(PyLong_Check(lasti));
                     _PyErr_SetString(tstate, PyExc_SystemError, "lasti is not an int");
                     ERROR_NO_POP();
                 }