[Bug tree-optimization/59249] if-conversion doesn't handle basic-blocks with only critical predecessor edges

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59249

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Btw, see PR57521 for how the code is different from that on the 4.8 branch.