Remove CHECK which fail while the locale is long.

Bug: chromium:997401
Change-Id: I7a78f4ad1fd05ab2bb2dbcd343060b2647aef4e6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1771954
Commit-Queue: Frank Tang <ftang@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63660}

src/objects/intl-objects.cc

@@ -1693,7 +1693,12 @@ std::map<std::string, std::string> LookupAndValidateUnicodeExtensions(
     status = U_ZERO_ERROR;
     icu_locale->setUnicodeKeywordValue(
         bcp47_key == nullptr ? keyword : bcp47_key, nullptr, status);
-    CHECK(U_SUCCESS(status));
+    // Ignore failures in ICU and skip to the next keyword.
+    //
+    // This is fine.™
+    if (U_FAILURE(status)) {
+      status = U_ZERO_ERROR;
+    }
   }
 
   return extensions;

test/intl/regress-997401.js

+// Copyright 2019 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 no crash with a very long locale.
+let dtf = new Intl.DateTimeFormat(
+  'de-u-cu-eur-em-default-hc-h23-ks-level1-lb-strict-lw-normal-ms-metric-nu-latn-rg-atzzzz-sd-atat1-ss-none-tz-atvie-va-posix');