Pierre-Yves David <pierre-yves.david@octobus.net> [Mon, 03 May 2021 21:04:55 +0200] rev 47254
revlog: add a `_get_decompressor` method
This logic is non-trivial and we will need to reuse it.
Differential Revision: https://phab.mercurial-scm.org/D10651