[Bug libstdc++/70898] Stateful Compare objects are very slow

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70898

--- Comment #4 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #3)
> This is being tracked as PR 51965

PR 51965 seems to be about extra copies of the values, while this one is more
about extra copies of compare objects (then there are also extra copies of
iterators).