[Bug rtl-optimization/84169] [8 Regression] wrong code with u128 multiplication result at aarch64 -O

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84169

--- Comment #7 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Yeah, not planning to do backports, although the core problem is ancient.