[Bug tree-optimization/102138] t = a==0 and a = PHI<0, t> should be done earlier than PRE

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102138

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
that is we should be able to optimize lenzero at -O1.