cgen: fix type_default for option type when the default expr is none
#8865
| Job | Run time |
|---|---|
| 39m 24s | |
| 26m 14s | |
| 35m 56s | |
| 1h 41m 34s |
none
#8865
| Job | Run time |
|---|---|
| 39m 24s | |
| 26m 14s | |
| 35m 56s | |
| 1h 41m 34s |