Some polishings in RefinedPrinter

 - drop redundant test
 - avoid computing owner of NoSymbol

Author: odersky

compiler/src/dotty/tools/dotc/printing/RefinedPrinter.scala

@@ -169,8 +169,6 @@ class RefinedPrinter(_ctx: Context) extends PlainPrinter(_ctx) {
     }
 
     homogenize(tp) match {
-      case x: ConstantType if homogenizedView =>
-        return toText(x.widen)
       case AppliedType(tycon, args) =>
         val cls = tycon.typeSymbol
         if (tycon.isRepeatedParam) return toTextLocal(args.head) ~ "*"
@@ -617,7 +615,7 @@ class RefinedPrinter(_ctx: Context) extends PlainPrinter(_ctx) {
   }
 
   private def toTextOwner(tree: Tree[_]) =
-    "[owner = " ~ tree.symbol.owner.show ~ "]" provided ctx.settings.YprintDebugOwners.value
+    "[owner = " ~ tree.symbol.maybeOwner.show ~ "]" provided ctx.settings.YprintDebugOwners.value
 
   protected def dclTextOr[T >: Untyped](tree: Tree[T])(treeText: => Text) =
     toTextOwner(tree) ~ {