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revbranchcache: factor logic to write names and revs in separate functions

Authored by pulkit.

Description

revbranchcache: factor logic to write names and revs in separate functions

Before this patch, the write function was so populated with upto 4 level of
indentation, it was hard to understand what's going on.

Differential Revision: https://phab.mercurial-scm.org/D6291