Add test for issue 20190.

tests/standalone/int_list_test.dart

+// Copyright (c) 2014, 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.
+//
+// Dart Mint representations and type propagation issue.
+//
+// VMOptions=--optimization-counter-threshold=5 --no-use-osr
+
+import 'dart:typed_data';
+import "package:expect/expect.dart";
+
+main() {
+  var a = new Uint32List(100);
+  a[2] = 3;
+  var res = sumIt1(a, 2);
+  Expect.equals(3 * 10, res);
+  res = sumIt1(a, 2);
+  Expect.equals(3 * 10, res);
+  a = new Int32List(100);

[hausner, 2014/07/24 21:05:45]

I guess except for you, nobody would know why you need a new array and a second
sumIt function. Maybe add a short comment?

[srdjan, 2014/07/24 21:26:58]

Adding comment: test Uint32List and Int32List loads.

+  a[2] = 3;
+  res = sumIt2(a, 2);
+  Expect.equals(3 * 10, res);
+  res = sumIt2(a, 2);
+  Expect.equals(3 * 10, res);
+

[hausner, 2014/07/24 21:05:45]

Nit: comply with 2011 Blank Line Conservation Act please, here and in line 27
below.

[srdjan, 2014/07/24 21:26:58]

Hmm, somehow the latest (and space conserving) CL did not get properly uploaded.

Done.

+}
+
+
+
+sumIt1(Uint32List a, int n) {
+  var sum = 0;
+  for (int i = 0; i < 10; i++) {
+    sum += a[n];
+  }
+  return sum;
+}
+
+sumIt2(Int32List a, int n) {
+  var sum = 0;
+  for (int i = 0; i < 10; i++) {
+    sum += a[n];
+  }
+  return sum;
+}