gen_stubs: Add complete coverage for all (non-ILP32) arches.
#15603
| Job | Run time |
|---|---|
| 2h 9m 42s | |
| 2h 6m 12s | |
| 2h 52m 24s | |
| 1h 27m 9s | |
| 1h 26m 42s | |
| 1h 4m 19s | |
| 2h 37m 31s | |
| 1h 14m 33s | |
| 1h 54m 43s | |
| 2h 4m 8s | |
| 18h 57m 23s |