deps: backport bff3074 from V8 upstream

Original commit message:

    Allow ICU to normalize time zones

    There's at least one case of a time zone alias: Asia/Kathmandu aliases
    Asia/Katmandu. ICU seems to normalize to the (deprecated) latter choice.
    V8 internationalization choked on this change; this patch interprets
    ICU's output more precisely and allows it.

    BUG=chromium:487322
    R=jungshik,adamk
    LOG=Y

    Review URL: https://codereview.chromium.org/1509273007

    Cr-Commit-Position: refs/heads/master@{#32769}

PR-URL: #15562
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Steven R Loomis <srloomis@us.ibm.com>

deps/v8/include/v8-version.h

@@ -11,7 +11,7 @@
 #define V8_MAJOR_VERSION 4
 #define V8_MINOR_VERSION 5
 #define V8_BUILD_NUMBER 103
-#define V8_PATCH_LEVEL 51
+#define V8_PATCH_LEVEL 52
 
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)

deps/v8/src/i18n.js

@@ -1562,7 +1562,7 @@ function initializeDateTimeFormat(dateFormat, locales, options) {
   var formatter = %CreateDateTimeFormat(
     requestedLocale, {skeleton: ldmlString, timeZone: tz}, resolved);
 
-  if (!IS_UNDEFINED(tz) && tz !== resolved.timeZone) {
+  if (resolved.timeZone === "Etc/Unknown") {
     throw MakeRangeError(kUnsupportedTimeZone, tz);
   }
 

deps/v8/test/mjsunit/regress/regress-487322.js

@@ -0,0 +1,13 @@
+// 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/Paris'}));