[Bug target/118166] simple bit operations for __int128 do not use vector operations/registers

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118166

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note there is an extra cost of moving between the gprs and vector registers. In
this case I suspect using gprs is still cheaper even if size might be slightly
larger