[Bug tree-optimization/102659] -O2 vectorization if-conversion produces wrong code for gcc.dg/torture/pr69760.c

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102659

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 51584
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51584&action=edit
patch I am testing

I'm testing this patch, hopefully without bad side-effects on SCEV/data-ref
analysis ... (but I fear not...)