Add a bigint test with --no_intrinsify.

tests/corelib/big_integer_huge_mul_vm_test.dart

+// Copyright (c) 2011, 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.
+
+// Testing Bigints with and without intrinsics.
+// VMOptions=
+// VMOptions=--no_intrinsify
+
+library big_integer_test;
+import "package:expect/expect.dart";
+
+testBigintHugeMul() {
+  var bits = 65536;
+  var a = 1 << bits;
+  var a1 = a - 1;  // all 1's
+  var p1 = a1 * a1;
+  var p2 = a * a - a - a + 1;
+  // Use isTrue instead of equals to avoid trying to print such big numbers.
+  Expect.isTrue(p1 == p2, 'products do not match');
+}
+
+main() {
+  testBigintHugeMul();
+}