enh: remove simd_nightly feature flag for aarch64
#290
| Job | Run time |
|---|---|
| 4m 44s | |
| 7s | |
| 4m 44s | |
| 28s | |
| 2m 14s | |
| 4m 59s | |
| 2m 44s | |
| 2m 16s | |
| 3m 6s | |
| 1m 43s | |
| 4m 14s | |
| 1m 50s | |
| 2m 2s | |
| 1m 50s | |
| 1m 44s | |
| 1m 44s | |
| 2m 11s | |
| 1m 50s | |
| 1m 40s | |
| 46m 10s |