Revert the revert of http://code.google.com/p/dart/source/detail?r=3360.

compiler/lib/implementation/array.dart

Index: compiler/lib/implementation/array.dart
diff --git a/compiler/lib/implementation/array.dart b/compiler/lib/implementation/array.dart
index 2690982aacaca6cd287c262747f1bae76388abfb..698f7245bc0f48e19f9bee5d918c8f7f10ba8c16 100644
--- a/compiler/lib/implementation/array.dart
+++ b/compiler/lib/implementation/array.dart
@@ -22,15 +22,11 @@ class ListFactory<E> {
     } else if (length < 0) {
       throw new IllegalArgumentException("negative length $length");
     }
-    // TODO(floitsch): make list creation more efficient. Currently we allocate
-    // a new TypeToken at every allocation. Either we can optimize them away,
-    // or we need to find other ways to pass type-information from Dart to JS.
-    ListImplementation list = _new(new TypeToken<E>(), length);
+    
+    ListImplementation<E> list = new ListImplementation<E>(length);
     list._isFixed = isFixed;
     return list;
   }
-
-  static ListImplementation _new(TypeToken typeToken, int length) native;
 }
 
 
@@ -42,6 +38,8 @@ class ListImplementation<T> implements List<T> native "Array" {
   // and coerce to false.
   bool _isFixed;
 
+  ListImplementation(int length);
+
   T operator[](int index) native;
   void operator[]=(int index, T value) native;