Fix right shifting of a Mint value by an amount larger than 63.

tests/language/regress_24283_test.dart

Index: tests/language/regress_24283_test.dart
diff --git a/tests/language/regress_24283_test.dart b/tests/language/regress_24283_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..d98e8291e1f9dcf30429fb1961ebea53d09a90e8
--- /dev/null
+++ b/tests/language/regress_24283_test.dart
@@ -0,0 +1,23 @@
+// 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.
+
+import "package:expect/expect.dart";
+
+main() {
+  // Smi
+  var i = 1 << 30;
+  var j = -i;
+  Expect.equals(0, i >> 37);
+  Expect.equals(-1, j >> 37);
+  // Mint
+  i = 1 << 50;
+  j = -i;
+  Expect.equals(0, i >> 67);
+  Expect.equals(-1, j >> 67);
+  // Bigint
+  i = i << 120;
+  j = -i;
+  Expect.equals(0, i >> 199);
+  Expect.equals(-1, j >> 199);
+}