dart2js-kernel: Recognize some List constructors.

tests/compiler/dart2js/kernel/compile_from_dill_test_helper.dart

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Helper to test compilation equivalence between source and .dill based
 // compilation.
 library dart2js.kernel.compile_from_dill_test_helper;
 
 import 'dart:async';
 
@@ skipping 165 matching lines @@
 }
 '''
   }, expectIdenticalOutput: true),
   const Test(const {
     'main.dart': '''
 class _Marker { const _Marker(); }
 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),
 ];
 
 enum ResultKind { crashes, errors, warnings, success, failure }
 
 const List<String> commonOptions = const <String>[
   Flags.disableTypeInference,
   Flags.disableInlining,
@@ skipping 153 matching lines @@
       Map<String, BufferedOutputSink> map2 = collector2.outputMap[outputType];
       checkSets(map1.keys, map2.keys, 'output', equality);
       map1.forEach((String name, BufferedOutputSink output1) {
         BufferedOutputSink output2 = map2[name];
         Expect.stringEquals(output1.text, output2.text);
       });
     });
   }
   return ResultKind.success;
 }