[Bug tree-optimization/81611] [8 Regression] gcc un-learned loop / post-increment optimization

[law at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81611

--- Comment #23 from Jeffrey A. Law <law at redhat dot com> ---
No, the DOM change is only a partial fix.  I've largely approved the auto-inc
change.  I recommend the additional tests in c#19 be pulled into a distinct BZ
and the gcc8 regression marker removed once the auto-inc changes are committed.