Use a regular ICU API for el-Upper

test/intl/general/case-mapping.js

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Flags: --icu_case_mapping
 
 // Some edge cases that unibrow got wrong
 
 assertEquals("𐐘", "𐑀".toUpperCase());
 assertEquals("𐑀", "𐐘".toLowerCase());
@@ skipping 66 matching lines @@
 assertEquals("άόύώ".toLocaleUpperCase([]),
              "άόύώ".toLocaleUpperCase(Intl.GetDefaultLocale));
 
 
 // English/root locale keeps U+0307 (combining dot above).
 assertEquals("abci\u0307", "aBcI\u0307".toLocaleLowerCase("en"));
 assertEquals("abci\u0307", "aBcI\u0307".toLocaleLowerCase(["en", "tr"]));
 assertEquals("abci\u0307", "aBcI\u0307".toLowerCase());
 
 // Greek uppercasing: not covered by intl402/String/*, yet. Tonos (U+0301) and
-// other diacritic marks are dropped. This rule is based on the current CLDR's
-// el-Upper transformation, but Greek uppercasing rules are more sophisticated
-// than this. See http://bugs.icu-project.org/trac/ticket/10582 and
-// http://unicode.org/cldr/trac/ticket/7905 .
+// other diacritic marks are dropped.  See
+// http://bugs.icu-project.org/trac/ticket/5456#comment:19 for more examples.
+// See also http://bugs.icu-project.org/trac/ticket/12845 .
 assertEquals("Α", "α\u0301".toLocaleUpperCase("el"));
 assertEquals("Α", "α\u0301".toLocaleUpperCase("el-GR"));
 assertEquals("Α", "α\u0301".toLocaleUpperCase("el-Grek"));
 assertEquals("Α", "α\u0301".toLocaleUpperCase("el-Grek-GR"));
 assertEquals("Α", "ά".toLocaleUpperCase("el"));
-assertEquals("ΑΟΥΩ", "άόύώ".toLocaleUpperCase("el"));
-assertEquals("ΑΟΥΩ", "α\u0301ο\u0301υ\u0301ω\u0301".toLocaleUpperCase("el"));
-assertEquals("ΑΟΥΩ", "άόύώ".toLocaleUpperCase("el"));
+assertEquals("ΑΟΫΩ", "άόύώ".toLocaleUpperCase("el"));
+assertEquals("ΑΟΫΩ", "α\u0301ο\u0301υ\u0301ω\u0301".toLocaleUpperCase("el"));
+assertEquals("ΑΟΫΩ", "άόύώ".toLocaleUpperCase("el"));
 assertEquals("ΟΕ", "Ό\u1f15".toLocaleUpperCase("el"));
 assertEquals("ΟΕ", "Ο\u0301ε\u0314\u0301".toLocaleUpperCase("el"));
+assertEquals("ΡΩΜΕΪΚΑ", "ρωμέικα".toLocaleUpperCase("el"));
+assertEquals("ΜΑΪΟΥ, ΤΡΟΛΕΪ", "Μαΐου, τρόλεϊ".toLocaleUpperCase("el"));
+assertEquals("ΤΟ ΕΝΑ Ή ΤΟ ΑΛΛΟ.", "Το ένα ή το άλλο.".toLocaleUpperCase("el"));
 
 // Input and output are identical.
 assertEquals("αβγδε", "αβγδε".toLocaleLowerCase("el"));
 assertEquals("ΑΒΓΔΕ", "ΑΒΓΔΕ".toLocaleUpperCase("el"));
 assertEquals("ΑΒΓΔΕАБ𝐀𝐁", "ΑΒΓΔΕАБ𝐀𝐁".toLocaleUpperCase("el"));
 assertEquals("ABCDEÂÓḴ123", "ABCDEÂÓḴ123".toLocaleUpperCase("el"));
 // ASCII-only or Latin-1 only: 1-byte
 assertEquals("ABCDE123", "ABCDE123".toLocaleUpperCase("el"));
 assertEquals("ABCDEÂÓ123", "ABCDEÂÓ123".toLocaleUpperCase("el"));
 
@@ skipping 18 matching lines @@
 assertEquals("\u{1D400}\u{1D41A}", "\u{1D400}\u{1D41A}".toUpperCase());
 assertEquals("\u{1D400}\u{1D41A}", "\u{1D400}\u{1D41A}".toLowerCase());
 // Plane 1; New characters in Unicode 8.0
 assertEquals("\u{10C80}", "\u{10CC0}".toUpperCase());
 assertEquals("\u{10CC0}", "\u{10C80}".toLowerCase());
 assertEquals("\u{10C80}", "\u{10CC0}".toLocaleUpperCase());
 assertEquals("\u{10CC0}", "\u{10C80}".toLocaleLowerCase());
 assertEquals("\u{10C80}", "\u{10CC0}".toLocaleUpperCase(["tr"]));
 assertEquals("\u{10C80}", "\u{10CC0}".toLocaleUpperCase(["tr"]));
 assertEquals("\u{10CC0}", "\u{10C80}".toLocaleLowerCase());