[regexp] Port RegExp getters and setters

test/mjsunit/messages.js

 // Copyright 2015 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.
 
 // Flags: --stack-size=100 --harmony
 // Flags: --harmony-simd
 
 function test(f, expected, type) {
   try {
     f();
@@ skipping 105 matching lines @@
   Object.preventExtensions(o);
   Object.defineProperty(o, "x", { value: 1 });
 }, "Cannot define property:x, object is not extensible.", TypeError);
 
 // kFirstArgumentNotRegExp
 test(function() {
   "a".startsWith(/a/);
 }, "First argument to String.prototype.startsWith " +
    "must not be a regular expression", TypeError);
 
-// kFlagsGetterNonObject
-test(function() {
-  Object.getOwnPropertyDescriptor(RegExp.prototype, "flags").get.call(1);
-}, "RegExp.prototype.flags getter called on non-object 1", TypeError);
-
 // kFunctionBind
 test(function() {
   Function.prototype.bind.call(1);
 }, "Bind must be called on a function", TypeError);
 
 // kGeneratorRunning
 test(function() {
   var iter;
   function* generator() { yield iter.next(); }
   var iter = generator();
@@ skipping 309 matching lines @@
   Number(1).toString(100);
 }, "toString() radix argument must be between 2 and 36", RangeError);
 
 
 // === URIError ===
 
 // kURIMalformed
 test(function() {
   decodeURI("%%");
 }, "URI malformed", URIError);