[Bug c/70742] Support div as a builtin

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70742

--- Comment #16 from Drea Pinski <pinskia at gcc dot gnu.org> ---
Mentioned on the blog:
https://nukethebees.com/int-division-modulo-optimisation-differences-clang-gcc-msvc/