[Bug libstdc++/108846] std::copy, std::copy_n and std::copy_backward on potentially overlapping subobjects

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108846

--- Comment #27 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Backported for 12.4