Ensure that allocation sinking candidates are classified as not-aliased before final load forwardin…

tests/language/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.
 
 import "package:expect/expect.dart";
 import "dart:typed_data";
 
 class A {
   var x, y;
@@ skipping 53 matching lines @@
 
 testPhiConvertions(f, arr) {
   if (f) {
     arr[0] = arr[1];
   } else {
     arr[0] = arr[2];
   }
   return arr[0];
 }
 
+class M {
+  var x;
+  M(this.x);
+}
+
+fakeAliasing(arr) {
+  var a = new M(10);
+  var b = new M(10);
+  var c = arr.length;
+
+  if (c * c != c * c) {
+    arr[0] = a;  // Escape.
+    arr[0] = b;
+  }
+
+  return c * c;  // Deopt point.
+}
+
 main() {
   final fixed = new List(10);
   final growable = [];
   testImmutableVMFields(fixed, true);
   testImmutableVMFields(growable, false);
   testImmutableVMFields(growable, false);
 
   final f64List = new Float64List(2);
   testPhiRepresentation(true, f64List);
   testPhiRepresentation(false, f64List);
 
   for (var i = 0; i < 2000; i++) {
     Expect.listEquals([0x02010000, 0x03020100], foo(new A(0, 0)));
     Expect.listEquals([0x02010000, 0x03020100], bar(new A(0, 0), false));
     Expect.listEquals([0x04020000, 0x03020100], bar(new A(0, 0), true));
     testImmutableVMFields(fixed, true);
     testPhiRepresentation(true, f64List);
   }
 
   Expect.equals(1, testImmutableVMFields([], false));
   Expect.equals(2, testImmutableVMFields([1], false));
   Expect.equals(2, testImmutableVMFields([1, 2], false));
   Expect.equals(3, testImmutableVMFields([1, 2, 3], false));
 
   final u32List = new Uint32List(3);
   u32List[0] = 0;
   u32List[1] = 0x3FFFFFFF;
   u32List[2] = 0x7FFFFFFF;
-  
+
   for (var i = 0; i < 4000; i++) {
     testPhiConvertions(true, u32List);
     testPhiConvertions(false, u32List);
   }
+
+  final escape = new List(1);
+  for (var i = 0; i < 10000; i++) {
+    fakeAliasing(escape);
+  }
 }