merge: record the "other" node in merge state
We need to record the merge we were merging with. This solve multiple bug with resolve when dropping the second parent after a merge. This happen a lot when doing special merge (overriding the ancestor). Backout, shelve, rebase, etc. can takes advantage of it. This changeset just add the information in the merge state. We'll use it in the resolve process in a later changeset.
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