gh-125498: Update JIT builds to use LLVM 19 and use preserve_none
#1963
| Job | Run time |
|---|---|
| 6m 58s | |
| 10m 10s | |
| 17m 41s | |
| 22m 21s | |
| 18m 17s | |
| 22m 7s | |
| 6m 26s | |
| 7m 8s | |
| 1m 33s | |
| 1m 59s | |
| 8m 54s | |
| 13m 13s | |
| 7m 31s | |
| 17m 53s | |
| 8m 6s | |
| 13m 9s | |
| 1h 13m 11s | |
| 36m 11s | |
| 1h 8m 13s | |
| 38m 14s | |
| 6h 39m 15s |