Test for a bug that was fixed in r554 where we used unaligned accesses on ARM

with surprising results.
Review URL: http://codereview.chromium.org/8619

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@609 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/mjsunit/string-compare-alignment.js

+// Copyright 2008 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
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+//     * 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,
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+
+// Test that we can compare two strings that are not 4-byte aligned.
+// This situation can arise with sliced strings.  This tests for an ARM bug
+// that was fixed in r554.
+
+var base = "Now is the time for all good men to come to the aid of the party. " + 
+           "Now is the time for all good men to come to the aid of the party."
+var s1 = base.substring(0, 64);
+var s2 = base.substring(66, 130);
+
+var o = new Object();
+o[s1] = 1;
+o[s2] = 2;
+
+var first_time = true;
+
+for (var x in o) {
+  assertTrue(o[x] == 2, "expect 2");
+  assertTrue(first_time, "once only");
+  first_time = false;
+}