[Bug tree-optimization/63148] [4.8/4.9/5 Regression] r187042 causes auto-vectorization failure for X86 for -m32.

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63148

--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk the "right" way, still pondering of the best way to fix it on
the branches.  (aka less intrusive)