[Bug c++/96780] debuginfo for std::move and std::forward isn't useful

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96780

--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
As well as folding move and forward, it probably makes sense to do the same for
as_const and addressof (and our internal __addressof). addressof is
particularly annoying because it's uglier *and* slower than taking the address,
but 100% necessary because of ADL.