More tests recategorized

Author: odersky

tests/pending/pos/t8111.scala renamed to tests/disabled/not-representable/pos/t8111.scala

@@ -1,3 +1,4 @@
+// structural types, cannot represent
 trait T {
 
   def crashy(ma: Any): Unit = {

tests/pending/pos/t8237b.scala renamed to tests/disabled/typetags/pos/t8237b.scala

@@ -13,7 +13,7 @@ class C {
     {
       val a = 0
       object C {
-        new C().x
+        new C().x // error: cannot be accessed
       }
     }
   }