Determistically enter classes from directory into package scope

On Linux, the directory listing is not automatically sorted on Mac.
This leads to non-determistic ids of Symbols of the classes in a
directory, which in turn leads to instability of the ordering of
parents within inferred refinement types.

Notable, with this patch, we will stably infer:

```
scala> case class C(); case class D(); List(C(), D()).head
defined class C
defined class D
res0: Product with Serializable = C()
```

rather than sometimes getting `Serializable with Product` on
Linux. As such, I've removed the workarounds for this instability
in two test cases.

1 files changed, 1 insertions, 3 deletions

diff --git a/test/files/run/t7747-repl.scala b/test/files/run/t7747-repl.scala
index 0094d3ba98..8203f4c802 100644
--- a/test/files/run/t7747-repl.scala
+++ b/test/files/run/t7747-repl.scala
@@ -10,9 +10,7 @@ object Test extends ReplTest {
 
   override def normalize(s: String) = {
     // replace indylambda function names by <function0>
-    val s2 = """\$Lambda.*""".r.replaceAllIn(s, "<function0>")
-    // Normalize ordering of LUB
-    s2.replace("Serializable with Product", "Product with Serializable")
+    """\$Lambda.*""".r.replaceAllIn(s, "<function0>")
   }
 
   def code = """