Add alias identity information to array allocations.

tests/language/vm/load_to_load_forwarding_vm_test.dart

 // Copyright (c) 2012, 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.
 // Test correctness of side effects tracking used by load to load forwarding.
 
 // VMOptions=--optimization-counter-threshold=10
 
 import "package:expect/expect.dart";
 import "dart:typed_data";
 
@@ skipping 248 matching lines @@
 }
 
 testIndexedAliasedStore2(a, b, i) {
   a[0] = 1;
   a[1] = 2;
   if (a == b) {
     b[i] = 3;
   }
   return a[0] + a[1];
 }
+
+
+testIndexedAliasedStore3(i) {
+  var a = new List(2);
+  a[0] = 1;
+  a[i] = 3;
+  return a[0];
+}
+
+
+testIndexedAliasedStore4(b) {
+  var a = new List(2);
+  a[0] = 1;
+  b[0] = 3;
+  return a[0];
+}
+
+
 var indices = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
 
 class Z {
   var x = 42;
 }
 
 var global_array = new List<Z>(1);
 
 side_effect() {
   global_array[0].x++;
@@ skipping 63 matching lines @@
   final array = new List(3);
   for (var i = 0; i < 20; i++) {
     Expect.equals(3, testIndexedNoAlias(array));
   }
   for (var i = 0; i < 20; i++) {
     Expect.equals(5, testIndexedAliasedStore1(array, array));
   }
   for (var i = 0; i < 20; i++) {
     Expect.equals(4, testIndexedAliasedStore2(array, array, indices[1]));
   }
+  for (var i = 0; i < 20; i++) {
+    Expect.equals(3, testIndexedAliasedStore3(indices[0]));
+  }
+  for (var i = 0; i < 20; i++) {
+    Expect.equals(1, testIndexedAliasedStore3(indices[1]));
+  }
+
+  for (var i = 0; i < 20; i++) {
+    Expect.equals(1, testIndexedAliasedStore4(array));
+  }
 
   var test_array = new List(1);
   for (var i = 0; i < 20; i++) {
     Expect.equals(43, testAliasingStoreIndexed(global_array));
   }
 }