[Bug tree-optimization/84737] [8 Regression] 20% degradation in CPU2000 172.mgrid starting with r256888

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84737

--- Comment #12 from Richard Biener <rguenth at gcc dot gnu.org> ---
This still seems to lack proper analysis...  thus a candidate for deferring.