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rewriteutil: look up common predecessor on unfiltered repo

Authored by martinvonz.

Description

rewriteutil: look up common predecessor on unfiltered repo

Before this patch, the code looking for divergence could crash when
tried to look up a common predecessor in the filtered repo. This patch
fixes that by looking up the common predecessor in an unfiltered repo.

Differential Revision: https://phab.mercurial-scm.org/D10917