Enable more parts of whitelist

Author: odersky

test/dotc/scala-collections.whitelist

@@ -232,12 +232,12 @@
 ./scala-scala/src/library/scala/collection/immutable/SetProxy.scala
 
 # https://github.com/lampepfl/dotty/issues/942
-# ./scala-scala/src/library/scala/collection/immutable/SortedMap.scala
-#./scala-scala/src/library/scala/collection/immutable/SortedSet.scala
+./scala-scala/src/library/scala/collection/immutable/SortedMap.scala
+./scala-scala/src/library/scala/collection/immutable/SortedSet.scala
 
 # https://github.com/lampepfl/dotty/issues/941
-#./scala-scala/src/library/scala/collection/immutable/Stream.scala
-#./scala-scala/src/library/scala/collection/immutable/StreamView.scala
+./scala-scala/src/library/scala/collection/immutable/Stream.scala
+./scala-scala/src/library/scala/collection/immutable/StreamView.scala
 
 ./scala-scala/src/library/scala/collection/immutable/TreeMap.scala
 ./scala-scala/src/library/scala/collection/immutable/TreeSet.scala