FIR2IR: generate this reference to non-source class properly

#KT-53983 Fixed

compiler/testData/ir/irText/firProblems/thisInEnumConstructor.fir.kt.txt

@@ -0,0 +1,18 @@
+open enum class EE : Enum<EE> {
+  private constructor(myName: String = Companion.toString().lowercase()) /* primary */ {
+    super/*Enum*/<EE>()
+    /* <init>() */
+
+  }
+
+  val myName: String
+    field = myName
+    get
+
+  ENTRY = EE()
+
+  fun values(): Array<EE> /* Synthetic body for ENUM_VALUES */
+
+  fun valueOf(value: String): EE /* Synthetic body for ENUM_VALUEOF */
+
+}