[Bug tree-optimization/79334] Segfault on tree loop hoisting

[amodra at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79334

--- Comment #4 from Alan Modra <amodra at gmail dot com> ---
When you have the tree optimization bug fixed, this becomes an rtl optimization
bug since rtl pre does the same as tree pre..