Use AnnotationMirrorSet and remove usage of Set<AnnotationMirror>
#722
| Job | Run time |
|---|---|
| 4m 17s | |
| 5m 48s | |
| 6m 36s | |
| 4m 21s | |
| 5m 55s | |
| 6m 35s | |
| 4m 34s | |
| 5m 46s | |
| 6m 32s | |
| 4m 42s | |
| 7m 2s | |
| 6m 21s | |
| 1h 8m 29s |