[Bug tree-optimization/125295] UB shift is hoisted with -fsanitize=undefined

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125295

--- Comment #1 from Drea Pinski <pinskia at gcc dot gnu.org> ---
Code hoisting only is prevented for undefined behavior that traps. E.g.
division.
Preventing all code hoisting might be an issue.