[Bug tree-optimization/127149] Wrong code with vectorisation of popcount of bitint

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127149

--- Comment #1 from Drea Pinski <pinskia at gcc dot gnu.org> ---
I am not sure this is well defined.
I have to look into the ABI of aarch64 here about _BitInt and padding bits.