Don't sort sources in test

Author: allanrenucci

compiler/test/dotty/tools/TestSources.scala

@@ -68,7 +68,7 @@ object TestSources {
     try {
       val sources = files
         .filter(fileFilter)
-        .sorted // make compilation order deterministic
+        // .sorted // make compilation order deterministic (FIXME #5433)
         .iterator()
         .asScala
         .map(_.toString)