[Bug ipa/120006] [15/16 Regression] wrong code with -O2 -fipa-pta

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120006

--- Comment #10 from Sam James <sjames at gcc dot gnu.org> ---
It's definitely related to the x* functions. Using __builtin_XXX() instead
makes it work.