[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 #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Ok, I have a local patch in my tree waiting for an excuse to check in that does

t.c:18:8: note: improved number of alias checks from 50 to 2