Revert "Disable tests that timeout easily"

This reverts commit ce3f7b4.

Author: nicolasstucki

tests/run-with-compiler-custom-args/staged-streams_1.check

@@ -2,3 +2,18 @@
 
 12
 
+36
+
+2
+
+3
+
+7
+
+12
+
+15
+
+15
+
+72

tests/run-with-compiler-custom-args/staged-streams_1.scala

@@ -678,22 +678,21 @@ object Test {
     println
     println(test2().run)
     println
-    // FIXME re-enable in #4643 when we can cache the compiler context
-//    println(test3().run)
-//    println
-//    println(test4().run)
-//    println
-//    println(test5().run)
-//    println
-//    println(test6().run)
-//    println
-//    println(test7().run)
-//    println
-//    println(test8().run)
-//    println
-//    println(test9().run)
-//    println
-//    println(test10().run)
+    println(test3().run)
+    println
+    println(test4().run)
+    println
+    println(test5().run)
+    println
+    println(test6().run)
+    println
+    println(test7().run)
+    println
+    println(test8().run)
+    println
+    println(test9().run)
+    println
+    println(test10().run)
   }
 }