[Bug rtl-optimization/90001] Compile-time hog in swing modulo scheduler

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90001

--- Comment #7 from Arseny Solokha <asolokha at gmx dot com> ---
There are no backporting pending, I believe? If so, should this PR be closed
now?