Add corelib tests

test/codegen/corelib/bit_twiddling_bigint_test.dart

Index: test/codegen/corelib/bit_twiddling_bigint_test.dart
diff --git a/test/codegen/corelib/bit_twiddling_bigint_test.dart b/test/codegen/corelib/bit_twiddling_bigint_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..042f7b895c7fb507f8c49735e5ef7799c0fbd69c
--- /dev/null
+++ b/test/codegen/corelib/bit_twiddling_bigint_test.dart
@@ -0,0 +1,61 @@
+// 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.
+// Testing Bigints.
+
+library bit_twiddling_test;
+import "package:expect/expect.dart";
+
+// See bit_twiddling_test.dart first.  This file contains only the tests that
+// need Bigint or would fail in dart2js compatibility mode.
+
+testBitLength() {
+  check(int i, width) {
+    Expect.equals(width, i.bitLength, '$i.bitLength ==  $width');
+    // (~i) written as (-i-1) to avoid issues with limited range of dart2js ops.
+    Expect.equals(width, (-i-1).bitLength, '(~$i).bitLength == $width');
+  }
+
+  check(0xffffffffffffff, 56);
+  check(0xffffffffffffffff, 64);
+  check(0xffffffffffffffffff, 72);
+  check(0x1000000000000000000, 73);
+  check(0x1000000000000000001, 73);
+
+
+  check(0xfffffffffffffffffffffffffffffffffffffe, 152);
+  check(0xffffffffffffffffffffffffffffffffffffff, 152);
+  check(0x100000000000000000000000000000000000000, 153);
+  check(0x100000000000000000000000000000000000001, 153);
+}
+
+testToUnsigned() {
+  checkU(src, width, expected) {
+    Expect.equals(expected, src.toUnsigned(width));
+  }
+
+  checkU(0x100000100000000000001, 2, 1);
+  checkU(0x100000200000000000001, 60, 0x200000000000001);
+  checkU(0x100000200000000000001, 59, 0x200000000000001);
+  checkU(0x100000200000000000001, 58, 0x200000000000001);
+  checkU(0x100000200000000000001, 57, 1);
+}
+
+testToSigned() {
+  checkS(src, width, expected) {
+    Expect.equals(expected, src.toSigned(width),
+        '$src.toSigned($width) == $expected');
+  }
+
+  checkS(0x100000100000000000001, 2, 1);
+  checkS(0x100000200000000000001, 60,  0x200000000000001);
+  checkS(0x100000200000000000001, 59,  0x200000000000001);
+  checkS(0x100000200000000000001, 58, -0x200000000000000 + 1);
+  checkS(0x100000200000000000001, 57,  1);
+}
+
+main() {
+  testBitLength();
+  testToUnsigned();
+  testToSigned();
+}