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merge: introduce a clean_update() for that use-case

Authored by martinvonz.

Description

merge: introduce a clean_update() for that use-case

I find it hard to understand what value to pass for all the arguments
to merge.update(). I would like to introduce functions that are more
specific to each use-case. We already have graft(). This patch
introduces a clean_update() and uses it in some places to show that
it works.

Differential Revision: https://phab.mercurial-scm.org/D7902