[Bug target/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 #4 from Segher Boessenkool <segher at gcc dot gnu.org> ---
This starts to fail with r249850 (don't know yet what the problem is).