[Bug target/95082] LE implementations of vec_cnttz_lsbb and vec_cntlz_lsbb are wrong

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95082

--- Comment #4 from Segher Boessenkool <segher at gcc dot gnu.org> ---
But this PR has more info, so I'll close the older one as dup, instead.