Add missing Symbol.toStringTag feature flags

test/built-ins/ArrayIteratorPrototype/Symbol.toStringTag/value-direct.js

@@ -6,7 +6,7 @@ esid: sec-%arrayiteratorprototype%-@@tostringtag
 description: >
   The @@toStringTag attribute should be defined directly on the prototype.
 es6id: 22.1.5.2.2
-features: [Symbol.iterator]
+features: [Symbol.iterator, Symbol.toStringTag]
 ---*/
 
 var ArrayIteratorProto = Object.getPrototypeOf([][Symbol.iterator]());

test/built-ins/AsyncFunction/AsyncFunctionPrototype-to-string.js

@@ -7,6 +7,7 @@ esid: sec-async-function-prototype-properties-toStringTag
 description: >
   %AsyncFunctionPrototype% has a Symbol.toStringTag property of "AsyncFunction"
 includes: [propertyHelper.js]
+features: [Symbol.toStringTag]
 ---*/
 
 var AsyncFunction = async function foo() { }.constructor;

test/built-ins/Object/prototype/toString/proxy-function.js

@@ -14,7 +14,7 @@ info: |
     a. Set the [[Call]] internal method of P as specified in 9.5.12.
   [...]
 
-features: [Proxy]
+features: [Proxy, Symbol.toStringTag]
 ---*/
 
 var functionProxy = new Proxy(function() {}, {});

test/built-ins/Set/prototype/Symbol.toStringTag/property-descriptor.js

@@ -2,12 +2,13 @@
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
-  description: >
-      `Object.prototype.getOwnPropertyDescriptor` should reflect the value and
-      writability of the @@toStringTag attribute.
-  includes: [propertyHelper.js]
-  es6id: 23.2.3.12
- ---*/
+description: >
+    `Object.prototype.getOwnPropertyDescriptor` should reflect the value and
+    writability of the @@toStringTag attribute.
+includes: [propertyHelper.js]
+es6id: 23.2.3.12
+features: [Symbol.toStringTag]
+---*/
 
 var SetProto = Object.getPrototypeOf(new Set());
 

test/built-ins/TypedArray/prototype/Symbol.toStringTag/detached-buffer.js

@@ -11,6 +11,7 @@ info: >
   5. Assert: name is a String value.
   6. Return name.
 includes: [testTypedArray.js, detachArrayBuffer.js]
+features: [Symbol.toStringTag]
 ---*/
 
 testWithTypedArrayConstructors(function(TA) {

test/built-ins/TypedArray/prototype/Symbol.toStringTag/length.js

@@ -20,6 +20,7 @@ info: >
     object has the attributes { [[Writable]]: false, [[Enumerable]]: false,
     [[Configurable]]: true }.
 includes: [propertyHelper.js, testTypedArray.js]
+features: [Symbol.toStringTag]
 ---*/
 
 var desc = Object.getOwnPropertyDescriptor(TypedArray.prototype, Symbol.toStringTag);