fix: also do specialisation during Scala.js

Author: hamzaremmal

compiler/src/dotty/tools/dotc/transform/SpecializeApplyMethods.scala

@@ -25,9 +25,6 @@ class SpecializeApplyMethods extends MiniPhase with InfoTransformer {
 
   override def description: String = SpecializeApplyMethods.description
 
-  override def isEnabled(using Context): Boolean =
-    !ctx.settings.scalajs.value && !Feature.shouldBehaveAsScala2
-
   private def specApplySymbol(sym: Symbol, args: List[Type], ret: Type)(using Context): Symbol = {
     val name = nme.apply.specializedFunction(ret, args)
     // Create the symbol at the next phase, so that it is a valid member of the

compiler/src/dotty/tools/dotc/transform/SpecializeFunctions.scala

@@ -19,9 +19,6 @@ class SpecializeFunctions extends MiniPhase {
 
   override def runsAfter = Set(ElimByName.name)
 
-  override def isEnabled(using Context): Boolean =
-    !ctx.settings.scalajs.value
-
   /** Create forwarders from the generic applys to the specialized ones.
    */
   override def transformDefDef(ddef: DefDef)(using Context) = {

compiler/src/dotty/tools/dotc/transform/SpecializeTuples.scala

@@ -20,7 +20,6 @@ class SpecializeTuples extends MiniPhase:
 
   override def phaseName: String                 = SpecializeTuples.name
   override def description: String               = SpecializeTuples.description
-  override def isEnabled(using Context): Boolean = !ctx.settings.scalajs.value
 
   override def transformApply(tree: Apply)(using Context): Tree = tree match
     case Apply(TypeApply(fun: NameTree, targs), args)