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diff --git a/deps/v8/test/mjsunit/string-external-cached.js b/deps/v8/test/mjsunit/string-external-cached.js
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+++ b/deps/v8/test/mjsunit/string-external-cached.js
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+// Copyright 2010 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Flags: --expose-externalize-string --expose-gc
+// Test data pointer caching of external strings.
+
+function test() {
+  // Test string.charAt.
+  var charat_str = new Array(5);
+  charat_str[0] = "0123456789ABCDEF0123456789ABCDEF\
+0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF\
+0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF\
+0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF\
+0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF";
+  charat_str[1] = "0123456789ABCDEF";
+  for (var i = 0; i < 6; i++) charat_str[1] += charat_str[1];
+  try {  // String can only be externalized once
+    externalizeString(charat_str[0], false);
+    externalizeString(charat_str[1], true);
+  } catch (ex) { }
+  charat_str[2] = charat_str[0].slice(0, -1);
+  charat_str[3] = charat_str[1].slice(0, -1);
+  charat_str[4] = charat_str[0] + charat_str[0];
+
+  for (var i = 0; i < 5; i++) {
+    assertEquals('B', charat_str[i].charAt(6*16 + 11));
+    assertEquals('C', charat_str[i].charAt(6*16 + 12));
+    assertEquals('A', charat_str[i].charAt(3*16 + 10));
+    assertEquals('B', charat_str[i].charAt(3*16 + 11));
+  }
+
+  charat_short = "012";
+  try {  // String can only be externalized once
+    externalizeString(charat_short, true);
+  } catch (ex) { }
+  assertEquals("1", charat_short.charAt(1));
+
+  // Test regexp.
+  var re = /(A|B)/;
+  var rere = /(T.{1,2}B)/;
+  var ascii = "ABCDEFGHIJKLMNOPQRST";
+  var twobyte = "_ABCDEFGHIJKLMNOPQRST";
+  try {
+    externalizeString(ascii, false);
+    externalizeString(twobyte, true);
+  } catch (ex) { }
+  assertTrue(isAsciiString(ascii));
+  assertFalse(isAsciiString(twobyte));
+  var ascii_slice = ascii.slice(1,-1);
+  var twobyte_slice = twobyte.slice(2,-1);
+  var ascii_cons = ascii + ascii;
+  var twobyte_cons = twobyte + twobyte;
+  for (var i = 0; i < 2; i++) {
+    assertEquals(["A", "A"], re.exec(ascii));
+    assertEquals(["B", "B"], re.exec(ascii_slice));
+    assertEquals(["TAB", "TAB"], rere.exec(ascii_cons));
+    assertEquals(["A", "A"], re.exec(twobyte));
+    assertEquals(["B", "B"], re.exec(twobyte_slice));
+    assertEquals(["T_AB", "T_AB"], rere.exec(twobyte_cons));
+  }
+}
+
+// Run the test many times to ensure IC-s don't break things.
+for (var i = 0; i < 10; i++) {
+  test();
+}
+
+// Clean up string to make Valgrind happy.
+gc();
+gc();