internal/core/adt: remove resolved TODO

https://cuelang.org/cl/1193637 resolved this by adding CUE_DEBUG=sharing
which is on by default but can be disabled.

Signed-off-by: Daniel Martí <[email protected]>
Change-Id: I3fcd5c0a2806fc13b3cad009a8c09425007bca00
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1205568
Unity-Result: CUE porcuepine <[email protected]>
TryBot-Result: CUEcueckoo <[email protected]>
Reviewed-by: Matthew Sackman <[email protected]>

Author: mvdan

Diff for: internal/core/adt/share.go

@@ -126,8 +126,6 @@ func (n *nodeContext) share(c Conjunct, arc *Vertex, id CloseInfo) {
 }
 
 func (n *nodeContext) shareIfPossible(c Conjunct, arc *Vertex, id CloseInfo) bool {
-	// TODO: have an experiment here to enable or disable structure sharing.
-	// return false
 	if !n.ctx.Sharing {
 		return false
 	}