[MERGE] Relocate iter_changes' process_entry method to allow C optimisation.

[Robert Collins]

This is a simple relocation of an inner method into a class-with-state
that can be later C optimised.

No specific tests for it, but its a private method and fully tested via
the iter_changes logic.

-Rob
-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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