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

tests/language/list_test.dart

Index: tests/language/list_test.dart
diff --git a/tests/language/list_test.dart b/tests/language/list_test.dart
index d3afdf8be822999746a285f82d56e606a396466c..5a74e4fb6771d3928db421d45a2c195026a39493 100644
--- a/tests/language/list_test.dart
+++ b/tests/language/list_test.dart
@@ -5,6 +5,9 @@
 
 import "package:expect/expect.dart";
 
+class A { }
+class B { }
+
 class ListTest {
   static void TestIterator() {
     List<int> a = new List<int>(10);
@@ -42,6 +45,16 @@ class ListTest {
     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);
@@ -115,4 +128,5 @@ class ListTest {
 
 main() {
   ListTest.testMain();
+  ListTest.testSublistTypeArguments();
 }