[Bug tree-optimization/71437] [7 regression] Performance regression after r235817

[amker at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71437

--- Comment #10 from amker at gcc dot gnu.org ---
(In reply to amker from comment #9)
> Root cause should be in VRP, looks like the iterative algorithm depends on
> order of ssa operands and computes different range.

Testing a patch, though is kind of a workaround.