[Bug libstdc++/125228] Avoid using assert in libstdc++

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125228

--- Comment #14 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Thanks for the patch. Libstdc++ patches should be CC'd to the libstdc++ list as
well as gcc-patches.

https://gcc.gnu.org/contribute.html

We also need a copyright assignment or DCO sign-off under a real identity, not
an anonymous pseudonym.