[Bug tree-optimization/69452] [6 Regression] gcc ICE at -O3 on x86_64-linux-gnu in with verify_ssa failed

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69452

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 37461
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37461&action=edit
patch for testing

I am testing the attached - using a RPO walk rather than a domwalk