gh-115999: Specialize CALL_KW in free-threaded builds
#2337
| Job | Run time |
|---|---|
| 7m 42s | |
| 13m 28s | |
| 18m 48s | |
| 11m 52s | |
| 17m 55s | |
| 10m 41s | |
| 5m 20s | |
| 6m 19s | |
| 15m 39s | |
| 10m 45s | |
| 9m 5s | |
| 9m 13s | |
| 8m 39s | |
| 5m 48s | |
| 10m 17s | |
| 6m 50s | |
| 2h 48m 21s |