[Bug middle-end/117811] [12/13/14 Regression] bad code for conditional right shift with autovec and neon since r12-897-gde56f95afaaa22

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117811

--- Comment #25 from Richard Biener <rguenth at gcc dot gnu.org> ---
This looks good to backport?