[Bug rtl-optimization/93565] [9/10 regression] Combine duplicates instructions

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93565

--- Comment #17 from Segher Boessenkool <segher at gcc dot gnu.org> ---
That above commit is just a spec special, it doesn't solve anything else,
imnsho.