Delete TODO on MatchReducer

The suggested refactoring to composition over inheritance was blocked because MatchReducer requires modifying the mutable protected state (caseLambda) of its superclass, TypeComparer, before invoking dependent inherited methods.

Author: Lluc24

compiler/src/dotty/tools/dotc/core/MatchReducer.scala

@@ -45,10 +45,7 @@ object MatchReducer:
       case Stuck              => "Stuck"
       case NoInstance(fails)  => "NoInstance(" ~ Text(fails.map(p.toText(_) ~ p.toText(_)), ", ") ~ ")"
 
-/** A type comparer for reducing match types.
- *  TODO: Not sure this needs to be a type comparer. Can we make it a
- *  separate class?
- */
+/** A type comparer for reducing match types. */
 class MatchReducer(initctx: Context) extends TypeComparer(initctx) {
   import MatchReducer.*