Use AnnotationMirrorSet and remove usage of Set<AnnotationMirror>
#706
| Job | Run time |
|---|---|
| 1m 55s | |
| 1m 46s | |
| 1m 43s | |
| 1m 37s | |
| 2m 1s | |
| 1m 45s | |
| 1m 53s | |
| 1m 57s | |
| 2m 3s | |
| 1m 52s | |
| 1m 48s | |
| 1m 58s | |
| 22m 18s |