[ObjC] Move GPBEnumDescriptorFunc to be private.
#6061
| Job | Run time |
|---|---|
| 12m 4s | |
| 12m 4s |
GPBEnumDescriptorFunc to be private.
#6061
| Job | Run time |
|---|---|
| 12m 4s | |
| 12m 4s |