Update to irmin.2.8.

Ioana Cristescu requested to merge icristescu/tezos:update_irmin_2.8 into master


Update to irmin.2.8.0 (and associated packages index.1.4.2, repr.0.5.0). Associated tezos/opam-repository MR opam-repository!209 (closed).

The new version of irmin helps with the memory consumption during the migration (see #1682 (closed)).

The new version of index has a better memory usage as well, and allows an increase of an internal cache to 5 its size - the memory is not changed, but it allows for a faster bootstrapping (in our benchmarks the overall time is down from 930s to 700s).

Edited by Thomas Gazagnaire

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