tzname check fix

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.
-
-if (this.Intl) {
-  // 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/Paris'}));
-}