[Bug c/110738] GCC trunk failed to do some optimizations since GCC-8

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110738

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>Clang can remove all the code.

Clang does not implement the noipa attribute.