[Bug tree-optimization/60891] [4.9/4.10 Regression] ICE: SIGSEGV (Invalid write/read) in pre_and_rev_post_order_compute_fn with -O -fno-tree-ch -fno-tree-cselim -fno-tree-dominator-opts

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60891

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
loop_optimizer_init (AVOID_CFG_MODIFICATIONS); ends up adding a basic-block. 
Oops.  I have a patch.