[Bug libstdc++/70530] [DR2468] You should probably add addressof (a) != addressof (b) check to std::swap

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70530

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
DR 2468 now says we should do something like this.