[Bug ipa/127693] [13/14/15/16/17] Miscompilation: __builtin_constant_p branch removed then still apparently used

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127693

--- Comment #3 from Drea Pinski <pinskia at gcc dot gnu.org> ---
I think what gcc is doing for __builtin_constant_p is correct and exactly as
documented too. That is it is invalid expection from the qt libraries of
__builtin_constant_p to act differently