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dirstate: use a new `drop_merge_data` in `setparent`

What is happening in this `setparent` loop is that we remove all `merge`
related information when the dirstate is moved out of a `merge` situation.

So instead of shuffling state to get them where we want, we simply add a method
on the DirstateItem to do drop the information we want dropped.

Differential Revision: https://phab.mercurial-scm.org/D11506

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