[Bug tree-optimization/126332] -ftracer makes it harder to do ifcvt (like path splitting)

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126332

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
tracer was once run a bit later but (I?) moved it before the last FRE to do
optimizations it uncovers (it can also create threading opportunities I think,
by means of eating some of its cost).