[Bug rtl-optimization/68381] [6 Regression] wrong code and quality regression with __builtin_mul_overflow() @ aarch64

[ktkachov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68381

--- Comment #7 from ktkachov at gcc dot gnu.org ---
For the code quality regression Jakub recommends implementing an aarch64
expander for the overflow arithmetic standard names.

I've filed PR 68543 for that