testrunner: made -x work with individual tests (#8362)
#22275
| Job | Run time |
|---|---|
| 8m 14s | |
| 5m 41s | |
| 4m 22s | |
| 1m 1s | |
| 8m 35s | |
| 4m 24s | |
| 6m 20s | |
| 1m 41s | |
| 1m 33s | |
| 1m 36s | |
| 2m 51s | |
| 1m 50s | |
| 1m 51s | |
| 49m 59s |