[Bug tree-optimization/107477] spurious -Wrestrict warning

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107477

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Adding:

  if (s < 0) __builtin_unreachable();

"fixes" the warning.