[Bug c++/115626] relax -Wsign-conversion when initializing from a literal

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115626

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
-1ul and ~0ul are portable by the way.