.arcconfig

debugrevlog: fix for non-manifest object

The `filelog` object is no longer an actual revlog. Instead, the actual revlog
is stored in the `_revlog` attribute.

{
    "conduit_uri": "https://phab.mercurial-scm.org/api",
    "repository.callsign": "HG",
    "arc.land.onto.default": "@",
    "base": "hg:.^"
}