Merge branch 'en/merge-ort-recursive'

The ORT merge strategy learned to synthesize virtual ancestor tree
by recursively merging multiple merge bases together, just like the
recursive backend has done for years.

* en/merge-ort-recursive:
  merge-ort: implement merge_incore_recursive()
  merge-ort: make clear_internal_opts() aware of partial clearing
  merge-ort: copy a few small helper functions from merge-recursive.c
  commit: move reverse_commit_list() from merge-recursive

commit.h

@@ -179,6 +179,9 @@ void commit_list_sort_by_date(struct commit_list **list);
 /* Shallow copy of the input list */
 struct commit_list *copy_commit_list(struct commit_list *list);
 
+/* Modify list in-place to reverse it, returning new head; list will be tail */
+struct commit_list *reverse_commit_list(struct commit_list *list);
+
 void free_commit_list(struct commit_list *list);
 
 struct rev_info; /* in revision.h, it circularly uses enum cmit_fmt */