Fix type propagation for and operator.

tests/language/and_operation_on_non_integer_operand_test.dart

+// Copyright (c) 2015, 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.
+
+// Regression test for dart2js that used to miscompile boolean add operations 
+// if one of the operands was an int and the other was not (issue 22427).
+
+import "package:expect/expect.dart";
+
+class NotAnInt {
+  NotAnInt operator&(b) => this;
+}
+
+@AssumeDynamic() @NoInline()
+id(x) => x;
+
+main () {
+  var a = id(new NotAnInt());
+  Expect.equals(a, a & 5 & 2);
+}