[Bug tree-optimization/86367] FRE1 tree pass deletes code in gcc.target/powerpc/nan128-1.c when long double is IEEE 128

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86367

--- Comment #9 from Segher Boessenkool <segher at gcc dot gnu.org> ---
(In reply to Bill Schmidt from comment #8)
> That makes sense -- we already have a NaN rather than an SNaN by the time we
> hit the Ealias pass.

It's already a QNaN in 004t.original (the very first dump file) (but at the
time the builtin_nan* are constructed, in fold_const_builtin_nan, it is all
okay still).