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merge: use in-memory mergestate when using in-memory context

Authored by martinvonz.

Description

merge: use in-memory mergestate when using in-memory context

This is my version of Augie's D8568. It makes it so we don't touch the
mergestate on disk when using an in-memory context.

The reason that I want this is not the same as the reason that Augie
write his patch (though I agree with that reason too). My hope is to
make in-memory rebase not fall back to on-disk rebase when there are
conflict. I plan to do that by adding a
overlayworkingctx.reflect_in_workingcopy(). The idea is that that
will update the working copy, the dirstate and the mergestate as
necessary.

Differential Revision: https://phab.mercurial-scm.org/D9040