dirstate: avoid reading the map when possible (
issue5713) (
issue5717)
Before the recent refactor, we would not load the entire map until it was
accessed. As part of the refactor, that got lost and even just trying to load
the dirstate parents would load the whole map. This caused a perf regression
(
issue5713) and a regression with static http serving (
issue5717).
Making it lazy loaded again fixes both.
Differential Revision: https://phab.mercurial-scm.org/D1253
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