[Bug tree-optimization/69783] [6 Regression] Loop is not vectorized after r233212

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69783

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 37672
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37672&action=edit
patch