Merge array allocation and List._copyFromObjectArray to provide fast path for large arrays.

tests/language/list_test.dart

 // Copyright (c) 2011, 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.
 // Dart test program for testing arrays.
 
 import "package:expect/expect.dart";
 
+class A { }
+class B { }
+
 class ListTest {
   static void TestIterator() {
     List<int> a = new List<int>(10);
     int count = 0;
 
     // Basic iteration over ObjectList.
     for (int elem in a) {
       Expect.equals(null, elem);
       count++;
     }
@@ skipping 17 matching lines @@
     Expect.equals(15, sum);
 
     // Iterate over List.
     int sum2 = 0;
     for (int elem in fa) {
       sum2 += elem;
     }
     Expect.equals(sum, sum2);
   }
 
+  static void testSublistTypeArguments() {
+    final list1 = new List<A>(0).sublist(0);
+    Expect.isTrue(list1 is List<A>);
+    Expect.isTrue(list1 is! List<B>);
+
+    final list2 = new List<A>(0).toList(growable: false);
+    Expect.isTrue(list2 is List<A>);
+    Expect.isTrue(list2 is! List<B>);
+  }
+
   static void testMain() {
     int len = 10;
     List a = new List(len);
     Expect.equals(true, a is List);
     Expect.equals(len, a.length);
     a.forEach((element) { Expect.equals(null, element); });
     a[1] = 1;
     Expect.equals(1, a[1]);
     Expect.throws(() => a[len], (e) => e is RangeError);
 
@@ skipping 53 matching lines @@
     List list = new List();
     // We cannot write just 'list.removeLast' due to issue 3769.
     Expect.throws(() => list.removeLast(),
                   (e) => e is RangeError);
     Expect.equals(0, list.length);
   }
 }
 
 main() {
   ListTest.testMain();
+  ListTest.testSublistTypeArguments();
 }