[Bug tree-optimization/84178] [7/8 Regression] ICE in release_bb_predicate

[dmalcolm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84178

--- Comment #5 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Candidate patch/RFC:
  https://gcc.gnu.org/ml/gcc-patches/2018-02/msg00468.html