[PATCH] aarch64: Improve codegen in AdvSIMD logs

[Wilco Dijkstra]

Hi Pierre,

> Remove spurious ADRP and a few MOVs.
> Reduce memory access by using more indexed MLAs in polynomial.
> Align notation so that algorithms are easier to compare.
> Speedup on Neoverse V1 for log10 (8%), log (8.5%), and log2 (10%).
> Update error threshold in AdvSIMD log (now matches SVE log).
> ---
> OK for master? If so please commit for as I don't have commit rights.

OK. Pushed.

Cheers,
Wilco