Roll ICU to tz2020a on top of 65.1

Somehow the auto rolling of ICU does not happen after 2020/3/24
(see https://bugs.chromium.org/p/v8/issues/detail?id=10481) so I hand roll
ICU now.

For example, the following icu hash into chrome/src/DEPS was not yet
auto rolled after ~4 weeks:
2020/4/1 https://chromium-review.googlesource.com/c/chromium/src/+/2109133
2020/4/28 https://chromium-review.googlesource.com/c/chromium/src/+/2162266

Bug: chromium:1074578
Change-Id: I7ba0d240351f7458997e66a1e580564684a8b5a2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2173670Reviewed-by: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67485}

DEPS

@@ -76,7 +76,7 @@ deps = {
   'v8/third_party/depot_tools':
     Var('chromium_url') + '/chromium/tools/depot_tools.git' + '@' + 'dd2f620cce58bf627da3e3ec19eadedd71ab63b3',
   'v8/third_party/icu':
-    Var('chromium_url') + '/chromium/deps/icu.git' + '@' + 'd7aff76cf6bb0fbef3afa6c07718f78a80a70f8f',
+    Var('chromium_url') + '/chromium/deps/icu.git' + '@' + '84e9d0035875f383b98320d48f3e7008a23c3738',
   'v8/third_party/instrumented_libraries':
     Var('chromium_url') + '/chromium/src/third_party/instrumented_libraries.git' + '@' + 'bb3f1802c237dd19105dd0f7919f99e536a39d10',
   'v8/buildtools':

test/intl/regress-1074578.js

+// Copyright 2020 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.
+
+// Test the update of tz2020a
+// https://mm.icann.org/pipermail/tz-announce/2020-April/000058.html
+//    Morocco springs forward on 2020-05-31, not 2020-05-24.
+//    Canada's Yukon advanced to -07 year-round on 2020-03-08.
+//    America/Nuuk renamed from America/Godthab.
+//    zic now supports expiration dates for leap second lists.
+
+// A. Test Morocco springs forward on 2020-05-31, not 2020-05-24.
+
+const df1 = new Intl.DateTimeFormat(
+    "en",
+    {timeZone: "Africa/Casablanca", timeStyle: "long", dateStyle: "long"})
+const d1 = new Date("2020-05-25T00:00:00.000Z");
+const d2 = new Date("2020-05-31T00:00:00.000Z");
+
+// Before tz2020a change will get "May 25, 2020 at 1:00:00 AM GMT+1"
+assertEquals("May 25, 2020 at 12:00:00 AM GMT", df1.format(d1));
+
+// Before tz2020a change will get "May 31, 2020 at 1:00:00 AM GMT+1"
+assertEquals("May 31, 2020 at 12:00:00 AM GMT", df1.format(d2));
+
+// B. Test Canada's Yukon advanced to -07 year-round on 2020-03-08.
+const df2 = new Intl.DateTimeFormat(
+    "en",
+    {timeZone: "Canada/Yukon", dateStyle: "long", timeStyle: "long"});
+const d3 = new Date("2020-03-09T00:00Z");
+const d4 = new Date("2021-03-09T00:00Z");
+
+// Before tz202a change will get "March 8, 2020 at 5:00:00 PM PDT"
+assertEquals("March 8, 2020 at 5:00:00 PM MST", df2.format(d3));
+
+// Before tz202a change will get "March 8, 2021 at 4:00:00 PM PST"
+assertEquals("March 8, 2021 at 5:00:00 PM MST", df2.format(d4));
+
+// C. Test America/Nuuk renamed from America/Godthab.
+
+// Before tz2020a will throw RangeError.
+const df3 = new Intl.DateTimeFormat("en", {timeZone: "America/Nuuk"});
+
+// Renamed timezone will return the stable name before the rename.
+assertEquals("America/Godthab", df3.resolvedOptions().timeZone);