[PATCH] AArch64: Fix instability in AdvSIMD tan

[Wilco Dijkstra]

Hi Joe,

> Previously presence of special-cases in one lane could affect the
> results in other lanes due to unconditional scalar fallback. The old
> WANT_SIMD_EXCEPT option (which has never been enabled in libmvec) has
> been removed from AOR, making it easier to spot and fix this. 4%
> improvement in throughput with GCC 14 on Neoverse V1. This bug is
> present as far back as 2.39 (where tan was first introduced).

OK - committed.

Reviewed-by: Wilco Dijkstra  <Wilco.Dijkstra@arm.com>

Cheers,
Wilco