Performance tweak: touch fewer Apply nodes

Author: liufengyun

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

@@ -109,7 +109,7 @@ class SpecializeFunctions extends MiniPhase with InfoTransformer {
   /** Dispatch to specialized `apply`s in user code when available */
   override def transformApply(tree: Apply)(using Context) =
     tree match {
-      case Apply(fun, args) if fun.symbol.name == nme.apply =>
+      case Apply(fun: NameTree, args) if fun.name == nme.apply && args.size <= 3 =>
         val argTypes = fun.tpe.widen.firstParamTypes.map(_.widenSingleton.dealias)
         val retType  = tree.tpe.widenSingleton.dealias
         val isSpecializable =