[Bug rtl-optimization/80463] [6/7/8 Regression] ICE with -fselective-scheduling2 and -fvar-tracking-assignments

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80463

--- Comment #14 from Arseny Solokha <asolokha at gmx dot com> ---
Thank you for the analysis. I can fill a separate PR for this testcase if
that's more appropriate.

Meanwhile, I got two more testcases which I've just reported as PR83972 and
PR83973 not to clutter this PR too much, though both of them may be actually
duplicates of this one.