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treemanifests: store whether a lazydirs entry needs copied after materializing

Authored by spectral.

Description

treemanifests: store whether a lazydirs entry needs copied after materializing

Due to the way that things like manifestlog.get caches its values, without
making a copy (if necessary) after calling readsubtree(), we might end up
adjusting the state of the same object on different contexts, breaking things
like dirty state tracking (and probably other things).

Differential Revision: https://phab.mercurial-scm.org/D4874