Fix FromTasty tests

 - 3 tests saw minor tweaks to decompiled file.
 - 1 test had to be blacklisted, sicne superArgs in ShowTasty
is not yet implemented.

Author: odersky

compiler/test/dotc/run-from-tasty.blacklist

@@ -1,2 +1,5 @@
 # Closure type miss match
 eff-dependent.scala
+
+# superArgs missing (see TODO in tastyreflect/FromSymbol.scala)
+reduce-projection.scala

tests/pos/i2104b.decompiled

@@ -31,7 +31,7 @@ case class Pair[A, B](_1: A, _2: B) {
       throw new java.lang.IndexOutOfBoundsException(n.toString())
   }
 }
-object Pair
+object Pair extends scala.AnyRef()
 /** Decompiled from out/posTestFromTasty/pos/i2104b/Test.class */
 object Test {
   def main(args: scala.Array[scala.Predef.String]): scala.Unit = {
@@ -40,4 +40,4 @@ object Test {
         ()
     }
   }
-}
+}

tests/pos/simpleCaseClass-3.decompiled

@@ -22,4 +22,4 @@ case class A[T](x: T) {
       throw new java.lang.IndexOutOfBoundsException(n.toString())
   }
 }
-object A
+object A extends scala.AnyRef()

tests/run/valueclasses-pavlov.decompiled

@@ -8,7 +8,7 @@ final class Box1(val value: scala.Predef.String) extends scala.AnyVal() {
       false
   }
 }
-object Box1
+object Box1 extends scala.AnyRef()
 /** Decompiled from out/runTestFromTasty/run/valueclasses-pavlov/Box2.class */
 final class Box2(val value: scala.Predef.String) extends scala.AnyVal() with Foo {
   def box1(x: Box1): scala.Predef.String = "box1: ok"
@@ -21,7 +21,7 @@ final class Box2(val value: scala.Predef.String) extends scala.AnyVal() with Foo
       false
   }
 }
-object Box2
+object Box2 extends scala.AnyRef()
 /** Decompiled from out/runTestFromTasty/run/valueclasses-pavlov/C.class */
 class C(x: scala.Predef.String) {
   def this() = {
@@ -43,4 +43,4 @@ object Test {
     scala.Predef.println(f.box1(b1))
     scala.Predef.println(f.box2(b2))
   }
-}
+}