[Bug sanitizer/88109] UBSAN can't work with vector operations

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88109

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I'm not sure if we really want to declare those undefined for the GIMPLE IL.
NB, -ftrapv also doesn't work for those.