Add String.prototype.replaceAll test

test/annexB/built-ins/String/prototype/replaceAll/custom-replacer-emulates-undefined.js

@@ -0,0 +1,30 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-string.prototype.replaceall
+description: >
+  [[IsHTMLDDA]] object as @@replace method gets called.
+info: |
+  String.prototype.replaceAll ( searchValue, replaceValue )
+
+  [...]
+  2. If searchValue is neither undefined nor null, then
+    [...]
+    c. Let replacer be ? GetMethod(searchValue, @@replace).
+    d. If replacer is not undefined, then
+      i. Return ? Call(replacer, searchValue, « O, replaceValue »).
+features: [Symbol.replace, String.prototype.replaceAll, IsHTMLDDA]
+---*/
+
+var searchValue = $262.IsHTMLDDA;
+var replacerGets = 0;
+Object.defineProperty(searchValue, Symbol.replaceAll, {
+  get: function() {
+    replacerGets += 1;
+    return searchValue;
+  },
+  configurable: true,
+});
+
+assert.sameValue("".replaceAll(searchValue), null);
+assert.sameValue(replacerGets, 1);