re-enabled compiling to JS test cases now we've fixed the compilation of the latest comparator based standard library code

libraries/stdlib/src/kotlin/JLangIterablesSpecial.kt

@@ -5,6 +5,7 @@ import java.util.Collection
 import java.util.List
 import java.util.AbstractList
 import java.util.Iterator
+import java.util.Comparator
 
 /**
  * Count the number of elements in collection.
@@ -71,19 +72,6 @@ public fun <T> java.lang.Iterable<T>.last() : T {
   return last;
 }
 
-/**
- * Copies all elements into a [[List]] and sorts it by value of compare_function(element)
- *
- * E.g. arrayList("two" to 2, "one" to 1).sortBy({it._2}) returns list sorted by second element of tuple
- *
- * @includeFunctionBody ../../test/CollectionTest.kt sortBy
- */
-public inline fun <in T, R: Comparable<in R>> java.lang.Iterable<T>.sortBy(f: (T) -> R): java.util.List<T> {
-    val sortedList = this.toList()
-    java.util.Collections.sort(sortedList, comparator {(x, y) -> f(x).compareTo(f(y))})
-    return sortedList
-}
-
 /**
  * Checks if collection contains given item.
  *

libraries/stdlib/src/kotlin/JLangIterablesSpecialJVM.kt

@@ -0,0 +1,27 @@
+package kotlin
+
+import java.util.AbstractList
+import java.util.Collection
+import java.util.Comparator
+import java.util.Iterator
+import java.util.List
+
+// TODO this function is here as it breaks the JS compiler; lets move back to JLangIterablesSpecial when it works again :)
+
+/**
+ * Copies all elements into a [[List]] and sorts it by value of compare_function(element)
+ *
+ * E.g. arrayList("two" to 2, "one" to 1).sortBy({it._2}) returns list sorted by second element of tuple
+ *
+ * @includeFunctionBody ../../test/CollectionTest.kt sortBy
+ */
+public inline fun <in T, R: Comparable<in R>> java.lang.Iterable<T>.sortBy(f: (T) -> R): java.util.List<T> {
+    val sortedList = this.toList()
+    val sortBy: Comparator<T> = comparator<T> {(x: T, y: T) ->
+        val xr = f(x)
+        val yr = f(y)
+        xr.compareTo(yr)
+    }
+    java.util.Collections.sort(sortedList, sortBy)
+    return sortedList
+}