Use Rc instead of Arc for storing rustflags
#11979
| Job | Run time |
|---|---|
| 3m 9s | |
| 2m 4s | |
| 10m 49s | |
| 2m 50s | |
| 1m 51s | |
| 5s | |
| 2m 8s | |
| 2m 52s | |
| 4s | |
| 15s | |
| 8m 55s | |
| 13m 54s | |
| 14m 21s | |
| 13m 49s | |
| 22m 13s | |
| 23m 16s | |
| 12m 33s | |
| 22m 42s | |
| 28m 52s | |
| 0s | |
| 0s | |
| 3h 6m 42s |