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dirstate-v2: Only convert from SystemTime to Timestamp and not back

Authored by SimonSapin.

Description

dirstate-v2: Only convert from SystemTime to Timestamp and not back

Converting from Timestamp back to SystemTime was only used for equality
comparison, but this can also be done on Timestamp values.

Differential Revision: https://phab.mercurial-scm.org/D11631