Add partial implementation of `ArchiveGraph` class
Remove ordered result constrain from snapshot_get_heads, as it
is not require anymore after simplifying the origin-revision
layer algorithm.
Migrated from D6990 (view on Phabricator)
Staging instance, all changes can be removed at any time
Remove ordered result constrain from snapshot_get_heads, as it
is not require anymore after simplifying the origin-revision
layer algorithm.
Migrated from D6990 (view on Phabricator)