[Bug c/71199] Support overloadable attribute in GNU C front-end

[wschmidt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71199

--- Comment #11 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
After some experiments, we've found that a better approach is to continue using
the current poor-man's overloading scheme, and do more folding of built-in
calls following gimplification.  David, should we close this?