[Bug tree-optimization/120907] vectorizer creates redundunt vec_perm_expr for reversed access of array

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120907

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note there is an off by one error in the loop.