Reuse capacity when possible in <BytesMut as Buf>::advance impl
#625
| Job | Run time |
|---|---|
| 10m 37s | |
| 1m 44s | |
| 33s | |
| 1m 53s | |
| 40s | |
| 15s | |
| 42s | |
| 31s | |
| 2m 42s | |
| 1m 23s | |
| 2m 10s | |
| 14s | |
| 1m 2s | |
| 2m 26s | |
| 1m 30s | |
| 28m 22s |