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006c764694
Tree-level conflicts (#1624) will be stored as multiple trees associated with a single commit. This patch adds support for that in `backend::Commit` and in the backends. When the Git backend writes a tree conflict, it creates a special root tree for the commit. That tree has only the individual trees from the conflict as subtrees. That way we prevent the trees from getting GC'd. We also write the tree ids to the extra metadata table (i.e. outside of the Git repo) so we don't need to load the tree object to determine if there are conflicts. I also added new flag to `backend::Commit` indicating whether the commit is a new-style commit (with support for tree-level conflicts). That will help with the migration. We will remove it once we no longer care about old repos. When the flag is set, we know that a commit with a single tree cannot have conflicts. When the flag is not set, it's an old-style commit where we have to walk the whole tree to find conflicts.