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localrepo: introduce a `_quick_access_changeid` property

Authored by marmoute.

Description

localrepo: introduce a _quick_access_changeid property

Having faster access to null is cuteā€¦ but limited. We want to speedup access
to more useful revision, like .. We start with turning the fast path for
null into something more generic.

Differential Revision: https://phab.mercurial-scm.org/D7488