[Bug target/79712] Clang smarter about unrolling in fhourstones benchmark

[tulipawn at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79712

--- Comment #8 from PeteVine <tulipawn at gmail dot com> ---
Seeing as unrolling does such a great job on aarch64, surpassing clang, should
we leave the ARM issue bunched together with this one?