[Intl] Convert options arg to Object before processing it

This makes us spec compliant.

Bug: chromium:875643
Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng
Change-Id: I489870495fe1d326991c99f0551fe3329268c984
Reviewed-on: https://chromium-review.googlesource.com/1199910
Commit-Queue: Sathya Gunasekaran <gsathya@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55567}

src/js/intl.js

@@ -621,6 +621,8 @@ function SetNumberFormatDigitOptions(internalOptions, options,
 function CreateNumberFormat(locales, options) {
   if (IS_UNDEFINED(options)) {
     options = {__proto__: null};
+  } else {
+    options = TO_OBJECT(options);
   }
 
   var getOption = getGetOption(options, 'numberformat');

test/intl/number-format/options.js

+// 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.
+
+assertThrows(() => new Intl.NumberFormat('en', null));
+assertDoesNotThrow(() => new Intl.NumberFormat('en', undefined));
+
+for (let key of [false, true, "foo", Symbol, 1]) {
+  assertDoesNotThrow(() => new Intl.NumberFormat('en', key));
+}
+
+assertDoesNotThrow(() => new Intl.NumberFormat('en', {}));
+assertDoesNotThrow(() => new Intl.NumberFormat('en', new Proxy({}, {})));

test/intl/regress-875643.js

+// 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.
+
+new Intl.NumberFormat(undefined, false)