[Bug middle-end/86471] GCC/libstdc++ outputs inferior code for std::fill and std::fill_n vs std::memset on c-style arrays

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86471

--- Comment #17 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Matt Bentley from comment #16)
> Yup - arguably it would be nice to have an overload for vector iterators
> that does the same thing.

We already handle that, see the __niter_base functions which unwrap std::vector
and std::basic_string iterators into pointers.