[Bug c++/80265] __builtin_{memcmp,memchr,strlen} are not usable in constexpr functions

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80265

--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I think there was a bug report in the last month or so asking for some builtin
to detect when we're in a constexpr context.