Add global feature tag (#1600)

features.txt

@@ -89,6 +89,10 @@ json-superset
 # https://github.com/tc39/proposal-intl-locale
 Intl.Locale
 
+# Global
+# https://github.com/tc39/proposal-global
+global
+
 # Standard language features
 #
 # Language features that have been included in a published version of the

test/built-ins/global/global-object.js

@@ -5,6 +5,7 @@
 esid: sec-other-properties-of-the-global-object-global
 description: "'global' should be the global object"
 author: Jordan Harband
+features: [global]
 ---*/
 
 assert.sameValue(this, global);

test/built-ins/global/property-descriptor.js

@@ -6,8 +6,11 @@ esid: sec-other-properties-of-the-global-object-global
 description: "'global' should be writable, non-enumerable, and configurable"
 author: Jordan Harband
 includes: [propertyHelper.js]
+features: [global]
 ---*/
 
-verifyNotEnumerable(this, 'global');
-verifyWritable(this, 'global');
-verifyConfigurable(this, 'global');
+verifyProperty(this, "global", {
+    enumerable: false,
+    writable: true,
+    configurable: true,
+});