internal/core/adt: set label of current node in Unify
This results in better paths.
Note that this increases counters. This will soon
be moot, though, as new closedness gets away with
these.
Signed-off-by: Marcel van Lohuizen <mpvl@gmail.com>
Change-Id: Ie728dcf0b11275ed74b0d20a2efd7f608b3540f0
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1210975
Unity-Result: CUE porcuepine <cue.porcuepine@gmail.com>
Reviewed-by: Matthew Sackman <matthew@cue.works>
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>