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dirstate: store mtimes with nanosecond precision in memory

Authored by SimonSapin.

Description

dirstate: store mtimes with nanosecond precision in memory

Keep integer seconds since the Unix epoch,
together with integer nanoseconds in the 0 <= n < 1e9 range.

For now, nanoseconds are still always zero.
This commit is about data structure changes.

Differential Revision: https://phab.mercurial-scm.org/D11684