The code involved in set_possibly_dirty is now simpler and safe to use even
in the cases that the assert covered. So we can drop this assert.
It was the last user of merged_removed and from_p2_removed.
| Alphare | 
| hg-reviewers | 
The code involved in set_possibly_dirty is now simpler and safe to use even
in the cases that the assert covered. So we can drop this assert.
It was the last user of merged_removed and from_p2_removed.
| Automatic diff as part of commit; lint not applicable. | 
| Automatic diff as part of commit; unit tests not applicable. |