[Bug libstdc++/118855] Simplify when __builtin_*g builtins are available

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118855

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #0)
> That is not the problem in C++ with templates.  The advantage of
> __builtin_*g is that it will be shorter to parse, fewer ops in constexpr
> evaluation.

And fewer class template instantiations of __numeric_traits,
__numeric_traits_integer, __is_integer_nonstrict etc.