[Bug tree-optimization/69320] [6 Regression] wrong code generation at -O2 and higher

[law at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69320

--- Comment #9 from Jeffrey A. Law <law at redhat dot com> ---
I've backtested against all 4 duplicates and my change fixes all of them.