.arcconfig

util: ability to change capacity when copying lrucachedict

This will allow us to easily replace an lrucachedict with one
with a higher or lower capacity as consumers deem necessary.

IMO it is easier to just create a new cache instance than to
muck with the capacity of an existing cache. Mutating an existing
cache's capacity feels more prone to bugs.

Differential Revision: https://phab.mercurial-scm.org/D4500

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