[Bug tree-optimization/61289] [4.9 Regression] Bad jump threading generates infinite loop

[law at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61289

--- Comment #5 from Jeffrey A. Law <law at redhat dot com> ---
yes, I'll backport to the 4.9 branch.  Waiting to see if there's any
follow-ups.