[Bug tree-optimization/58380] [4.9 Regression] ice in fold_comparison

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58380

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
The symptom hints at a released SSA name being looked at.  That happens
if cfgcleanup looks at a dead code region (we especially run
TODO_cleanup_cfg before TODO_update_ssa to allow passes to be forgiving
with not removing dead blocks).  Eventually we guarded these foldings
but seem to have removed the guarding again.