[Bug target/121991] [16 Regression] 15% slowdown of 436.cactusADM and 7% slowdown of 410.bwaves on Aarch64

[pheeck at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121991

--- Comment #3 from Filip Kastl <pheeck at gcc dot gnu.org> ---
Yes, you're right.  PR 121770 is also about a bwaves slowdown that happened in
this commit range.  We could merge the two PRs somehow but maybe let's not --
let's not complicate this further.