[Bug tree-optimization/81503] [8 Regression] Wrong code at -O2

[wschmidt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81503

--- Comment #9 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
This is overkill, it has some test case fallout.  Will have to look a bit
deeper.