narrow: move manifestlog overrides to core
With this and the previous patch, I couldn't measure any significant
difference from `hg files -r .` in a FireFox repo with 65k files. I
tried with both a flat-manifest and a tree-manifest version of
it. Neither had the narrow extension enabled.
Differential Revision: https://phab.mercurial-scm.org/D3046
Mercurial
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