[Bug tree-optimization/71521] [6/7 Regression] Regression in GCC-7.0.0's optimizer

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71521

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r225108.