Ensure consistency of representations when replacing integer ops with constants

tests/standalone/regress_25335_test.dart

+// Copyright (c) 2016, 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 that canonicalization inserts constants with correct representation.
+// VMOptions=--optimization-counter-threshold=10 --optimization-filter=bar
+
+import 'dart:typed_data';
+
+toSigned(v, width) {
+  var signMask = 1 << (width - 1);
+  return (v & (signMask - 1)) - (v & signMask);
+}
+
+foo(value) {
+  return value >> 32;
+}
+
+bar(td) {
+  return toSigned(foo(td[0]), 64);
+}
+
+main() {
+  toSigned(1 << 1, 32);
+  toSigned(1 << 32, 32);
+
+  var l = new Int64List(1);
+  l[0] = 0xf8f7f6f5f4f3f2f1;
+
+  for (var i = 0; i < 20; i++) {
+    bar(l);
+  }
+}