[Bug tree-optimization/71144] [6/7/8/9 Regression] isl_aff.c:1001: position out of bounds

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71144

--- Comment #9 from Arseny Solokha <asolokha at gmx dot com> ---
I can reproduce ICEs w/ C testcases from comments 0 and 2 only w/ gcc 6.3. I
believe the issue is fixed on 7 and all newer branches.