gh-125498: Update JIT builds to use LLVM 19 and use preserve_none
#1977
| Job | Run time |
|---|---|
| 6m 53s | |
| 10m 24s | |
| 17m 28s | |
| 22m 5s | |
| 17m 46s | |
| 21m 21s | |
| 4m 51s | |
| 6m 22s | |
| 12m 28s | |
| 15m 49s | |
| 8m 49s | |
| 18m 49s | |
| 7m 54s | |
| 17m 21s | |
| 7m 49s | |
| 13m 50s | |
| 1h 12m 18s | |
| 36m 35s | |
| 1h 9m 19s | |
| 37m 35s | |
| 7h 5m 46s |