Fix y-umlaut to uppercase.

test/mjsunit/regress/regress-2984.js

 // Copyright 2013 the V8 project authors. All rights reserved.
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 // 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.
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 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-#include "v8.h"
+assertEquals("\u0178", "\xff".toUpperCase());
+assertEquals("abcdefghijklmn\xffopq",
+             ("ABCDEFGHIJKL" + "MN\u0178OPQ").toLowerCase());
+assertEquals("\xff", "\u0178".toLowerCase());
+assertEquals("ABCDEFGHIJKLMN\u0178OPQ",
+             ("abcdefghijk" + "lmn\xffopq").toUpperCase());
 
-#include "cctest.h"
-#include "cpu.h"
-
-using namespace v8::internal;
-
-
-TEST(RequiredFeaturesX64) {
-  // Test for the features required by every x86 CPU in compat/legacy mode.
-  CPU cpu;
-  CHECK(cpu.has_sahf());
-}