Allow ICU to normalize time zones

test/mjsunit/regress/regress-487322.js

+// Copyright 2015 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.
+
+// Normalizes Kat{h,}mandu (chromium:487322)
+df = new Intl.DateTimeFormat('en-US', {'timeZone': 'Asia/Katmandu'})
+assertEquals('Asia/Katmandu', df.resolvedOptions().timeZone);
+
+df = new Intl.DateTimeFormat('en-US', {'timeZone': 'Asia/Kathmandu'})
+assertEquals('Asia/Katmandu', df.resolvedOptions().timeZone);
+
+// Throws for unsupported time zones.
+assertThrows(() => Intl.DateTimeFormat(undefined, {timeZone: 'Aurope/Belgrade'}));

[adamk, 2015/12/10 17:33:13]

Nit: 80 char limit (misspell shorter :) )

[Dan Ehrenberg, 2015/12/10 17:55:36]

Done