chore: stdlib will copy scala.util.Sorting from Scala 2

Author: hamzaremmal

project/Scala2LibraryBootstrappedMiMaFilters.scala

@@ -31,7 +31,6 @@ object Scala2LibraryBootstrappedMiMaFilters {
       ProblemFilters.exclude[IncompatibleResultTypeProblem]("scala.reflect.ManifestFactory#NothingManifest.newArray"),
       ProblemFilters.exclude[IncompatibleResultTypeProblem]("scala.reflect.ManifestFactory#NullManifest.newArray"),
       ProblemFilters.exclude[ReversedMissingMethodProblem]("scala.collection.immutable.SortedMapOps.coll"),
-      ProblemFilters.exclude[DirectMissingMethodProblem]("scala.util.Sorting.scala$util$Sorting$$mergeSort$default$5")
     )
   )
 

project/ScalaLibraryPlugin.scala

@@ -102,6 +102,7 @@ object ScalaLibraryPlugin extends AutoPlugin {
     "scala/jdk/FunctionWrappers$FromJavaLongUnaryOperator.class",
     "scala/collection/ArrayOps$ReverseIterator.class",
     "scala/runtime/NonLocalReturnControl.class",
+    "scala/util/Sorting.class", "scala/util/Sorting$.class",  // Contains @specialized annotation
     )
 
 }