Support Bigint parameters in Int32x4 constructor

tests/lib/typed_data/int32x4_bigint_test.dart

Index: tests/lib/typed_data/int32x4_bigint_test.dart
diff --git a/tests/lib/typed_data/int32x4_bigint_test.dart b/tests/lib/typed_data/int32x4_bigint_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..539b23f2cfed11134f036f6f32b3800f60e50700
--- /dev/null
+++ b/tests/lib/typed_data/int32x4_bigint_test.dart
@@ -0,0 +1,16 @@
+// Copyright (c) 2013, 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.
+// VMOptions=--deoptimization_counter_threshold=1000 --optimization-counter-threshold=10
+
+// Library tag to be able to run in html test framework.
+library int32x4_bigint_test;
+
+import 'package:expect/expect.dart';
+import 'dart:typed_data';
+
+main() {
+  var n = 18446744073709551617;
+  var x = new Int32x4(n, 0, 0, 0);
+  Expect.equals(x.x, 1);
+}