[Bug rtl-optimization/71779] [5/6/7 regression] isl miscompiled with -mabi=ilp32

[schwab@linux-m68k.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71779

--- Comment #18 from Andreas Schwab <schwab@linux-m68k.org> ---
With the patches in #16 and #17 bootstrap was successful and the isl testsuite
passes.