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
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