Remove unused parameters of ThisRef

Author: liufengyun

compiler/src/dotty/tools/dotc/transform/init/Checker.scala

@@ -55,10 +55,7 @@ class Checker extends Phase {
           mdef match
           case tdef: TypeDef if tdef.isClassDef =>
             val cls = tdef.symbol.asClass
-            val ctor = cls.primaryConstructor
-            val args = ctor.defTree.asInstanceOf[DefDef].termParamss.flatten.map(_ => Hot)
-            val outer = Hot
-            val thisRef = ThisRef(cls, outer, ctor, args)
+            val thisRef = ThisRef(cls)
             given Trace = Trace.empty
             if shouldCheckClass(cls) then Semantic.addTask(thisRef)
           case _ =>

compiler/src/dotty/tools/dotc/transform/init/Semantic.scala

@@ -73,7 +73,9 @@ object Semantic {
   }
 
   /** A reference to the object under initialization pointed by `this` */
-  case class ThisRef(klass: ClassSymbol, outer: Value, ctor: Symbol, args: List[Value]) extends Ref
+  case class ThisRef(klass: ClassSymbol) extends Ref {
+    val outer = Hot
+  }
 
   /** An object with all fields initialized but reaches objects under initialization
    *