[Bug libstdc++/91620] [forward_]list::remove_if should respect to DR 526

[frankhb1989 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91620

--- Comment #1 from frankhb1989 at gmail dot com ---
(The issue number in the case seems a typo. It is introduced in
https://reviews.llvm.org/rL358534.)