Change new List(n) to return fixed length list.

tests/language/gc_test.dart

Index: tests/language/gc_test.dart
diff --git a/tests/language/gc_test.dart b/tests/language/gc_test.dart
index 9ae29a27965e1537e2353ac448836bf0109aa9a0..b64a4e31ea9d65b849234158a94ac9f7d5a126e2 100644
--- a/tests/language/gc_test.dart
+++ b/tests/language/gc_test.dart
@@ -7,12 +7,12 @@
 main() {
   var div;
   for (int i = 0; i < 200; ++i) {
-    List l = new List.fixedLength(1000000);
+    List l = new List(1000000);
     var m  = 2;
     div = (_) {
       var b = l;  // Was causing OutOfMemory.
     };
-    var lSmall = new List.fixedLength(3);
+    var lSmall = new List(3);
     // Circular reference between new and old gen objects.
     lSmall[0] = l;
     l[0] = lSmall;