[Bug tree-optimization/63738] [4.9/5 Regression] ssa corruption when compiled with -O3

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63738

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
It's the vectorizer via data-ref analysis that creates overlapping life-ranges
here.  I have a trivial fix.