Merge pull request #1500 from ljharb/matchall

Tests for String.prototype.matchAll

test/built-ins/Symbol/matchAll/cross-realm.js

+// Copyright (C) 2018 Peter Wong. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: pending
+description: Value shared by all realms
+info: |
+  Unless otherwise specified, well-known symbols values are shared by all
+  realms.
+features: [cross-realm, Symbol.matchAll]
+---*/
+
+var OSymbol = $262.createRealm().global.Symbol;
+
+assert.sameValue(Symbol.matchAll, OSymbol.matchAll);

test/built-ins/Symbol/matchAll/prop-desc.js

+// Copyright (C) 2018 Peter Wong. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: pending
+description: |
+    `Symbol.matchAll` property descriptor
+info: |
+    This property has the attributes { [[Writable]]: false, [[Enumerable]]:
+    false, [[Configurable]]: false }.
+includes: [propertyHelper.js]
+features: [Symbol.match]
+---*/
+
+assert.sameValue(typeof Symbol.matchAll, 'symbol');
+verifyNotEnumerable(Symbol, 'matchAll');
+verifyNotWritable(Symbol, 'matchAll');
+verifyNotConfigurable(Symbol, 'matchAll');