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dirstate-v2: Reuse existing paths when appending to a data file

Authored by SimonSapin.

Description

dirstate-v2: Reuse existing paths when appending to a data file

When writing a dirstate in v2 format by appending to an existing data file,
filenames / paths that are borrowed from the previous on-disk representation
can be reused.

Differential Revision: https://phab.mercurial-scm.org/D11096