Restore unnecessary changes

Author: liufengyun

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

@@ -244,7 +244,7 @@ object NameOps {
     /** This method is to be used on **type parameters** from a class, since
      *  this method does sorting based on their names
      */
-    def specializedFor(classTargs: List[Type], classTargsNames: List[Name], methodTargs: List[Type], methodTarsNames: List[Name])(using Context): Name = {
+    def specializedFor(classTargs: List[Type], classTargsNames: List[Name], methodTargs: List[Type], methodTarsNames: List[Name])(using Context): N = {
       val methodTags: Seq[Name] = (methodTargs zip methodTarsNames).sortBy(_._2).map(x => defn.typeTag(x._1))
       val classTags: Seq[Name] = (classTargs zip classTargsNames).sortBy(_._2).map(x => defn.typeTag(x._1))