[Intl] Add regression test for -u-tz- of Intl.DateTimeFormat

The fix need to be cherrypick from ICU.
Fix in https://github.com/unicode-org/icu/pull/286
Adds regression test for 8469.

Bug: v8:8469
Change-Id: If173058dd1113782fcf2ff5a55f962721f46aba5
Reviewed-on: https://chromium-review.googlesource.com/c/1340733
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58032}

test/intl/intl.status

@@ -29,6 +29,9 @@
 [ALWAYS, {
   # TODO(jochen): The following test is flaky.
   'overrides/caching': [PASS, FAIL],
+
+  # https://crbug.com/v8/8469
+  'regress-8469': [FAIL],
 }],  # ALWAYS
 
 ['variant == no_wasm_traps', {

test/intl/regress-8469.js

@@ -0,0 +1,87 @@
+// Copyright 2018 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.
+
+// The following tz are NOT impacted by v8:8469
+var some_tz_list = [
+  "ciabj",
+  "ghacc",
+];
+
+// The following tz ARE impacted by v8:8469
+var problem_tz_list = [
+  "etadd",
+  "tzdar",
+  "eheai",
+  "sttms",
+  "arirj",
+  "arrgl",
+  "aruaq",
+  "arluq",
+  "mxpvr",
+  "brbvb",
+  "arbue",
+  "caycb",
+  "brcgr",
+  "cayzs",
+  "crsjo",
+  "caydq",
+  "svsal",
+  "cafne",
+  "caglb",
+  "cagoo",
+  "tcgdt",
+  "ustel",
+  "bolpb",
+  "uslax",
+  "sxphi",
+  "mxmex",
+  "usnyc",
+  "usxul",
+  "usndcnt",
+  "usndnsl",
+  "ttpos",
+  "brpvh",
+  "prsju",
+  "clpuq",
+  "caffs",
+  "cayek",
+  "brrbr",
+  "mxstis",
+  "dosdq",
+  "brsao",
+  "gpsbh",
+  "casjf",
+  "knbas",
+  "lccas",
+  "vistt",
+  "vcsvd",
+  "cayyn",
+  "cathu",
+  "hkhkg",
+  "mykul",
+  "khpnh",
+  "cvrai",
+  "gsgrv",
+  "shshn",
+  "aubhq",
+  "auldh",
+  "imdgs",
+  "smsai",
+  "asppg",
+  "pgpom",
+];
+
+let expectedTimeZone = (new Intl.DateTimeFormat("en"))
+    .resolvedOptions().timeZone;
+
+function testTz(tz) {
+  print(tz);
+  let timeZone = (new Intl.DateTimeFormat("en-u-tz-" + tz))
+      .resolvedOptions().timeZone;
+  assertEquals(expectedTimeZone, timeZone);
+}
+
+// first test soem tz not impacted by v8:8469 to ensure testTz is correct.
+for (var tz of some_tz_list) testTz(tz);
+for (var tz of problem_tz_list) testTz(tz);