[Bug target/87288] [8 Regression] Segfault after const_cast with "-O2 -ftree-loop-vectorize" but _without_ "-mavx"

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87288

--- Comment #14 from Richard Biener <rguenth at gcc dot gnu.org> ---
I'm doing the backport now.