dart2js-kernel: Recognize some List constructors.

tests/compiler/dart2js/kernel/compile_from_dill_test_helper.dart

Index: tests/compiler/dart2js/kernel/compile_from_dill_test_helper.dart
diff --git a/tests/compiler/dart2js/kernel/compile_from_dill_test_helper.dart b/tests/compiler/dart2js/kernel/compile_from_dill_test_helper.dart
index 9d6a7ab439f449d3b9f3cb4ae9e665867fc42171..35f9fee4fd11f0f1d7dae82eb6a7a2677ac4a727 100644
--- a/tests/compiler/dart2js/kernel/compile_from_dill_test_helper.dart
+++ b/tests/compiler/dart2js/kernel/compile_from_dill_test_helper.dart
@@ -183,8 +183,16 @@ const _MARKER = const _Marker();
 class Thing<X> {
   Thing([length = _MARKER]);
 }
+foo(x) {
+  print(new List(x).length);
+}
 main() {
   print(new Thing<String>(100));
+
+  print(new List());
+  print(new List(4));
+  foo(3);
+  foo(4);
 }
 '''
   }, expectIdenticalOutput: true),