pkg: use adt.Unify instead of Value.Unify
This change should by itself be a no-op, as we
still need to pass cycle information through to
the respective OpContexts. This will be done in
a followup CL. We include these changes in a
separate CL, though, to be able to isolate any
issues that may arise from this change.
Issue #3649
Signed-off-by: Marcel van Lohuizen <mpvl@gmail.com>
Change-Id: I2e5d201252faf42207bf5f7a08445f5607391033
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1208701
Unity-Result: CUE porcuepine <cue.porcuepine@gmail.com>
Reviewed-by: Matthew Sackman <matthew@cue.works>
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>