Duplication of companion methods after using FromTasty fixed

Author: VladimirNik

src/dotty/tools/dotc/core/tasty/TreeUnpickler.scala

@@ -590,7 +590,7 @@ class TreeUnpickler(reader: TastyReader, tastyName: TastyName.Table) {
         case TYPEDEF | TYPEPARAM =>
           if (sym.isClass) {
             val companion = sym.scalacLinkedClass
-            if (companion != NoSymbol) {
+            if (companion != NoSymbol && symAtAddr.valuesIterator.contains(companion)) {
               import transform.SymUtils._
               if (sym is Flags.ModuleClass) sym.registerCompanionMethod(nme.COMPANION_CLASS_METHOD, companion)
               else sym.registerCompanionMethod(nme.COMPANION_MODULE_METHOD, companion)