internal/core/adt: remove unused parameters in Vertex.AddStruct
These have been unused since my simplification
in https://cuelang.org/cl/1226965.
Signed-off-by: Daniel Martí <mvdan@mvdan.cc>
Change-Id: I1ab396347fa573195302e5ca7ed39e0928cb4ff3
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1229432
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>
Unity-Result: CUE porcuepine <cue.porcuepine@gmail.com>
Reviewed-by: Matthew Sackman <matthew@cue.works>