[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 #3 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
(In reply to Arseny Solokha from comment #2)
> Trivial change to the testcase also makes gcc-8 ICE in
> mark_block_for_update():

Thanks; yes, I see this one segfault both trunk and gcc 7; gcc 6 is unaffected.