Add alias identity information to array allocations.

tests/language/vm/load_to_load_forwarding_vm_test.dart

Index: tests/language/vm/load_to_load_forwarding_vm_test.dart
===================================================================
--- tests/language/vm/load_to_load_forwarding_vm_test.dart	(revision 33493)
+++ tests/language/vm/load_to_load_forwarding_vm_test.dart	(working copy)
@@ -266,6 +266,24 @@
   }
   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 {
@@ -349,7 +367,17 @@
   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));