Make generators non-constructable.

test/mjsunit/harmony/reflect-construct.js

 // Copyright 2014 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: --harmony-reflect
 
 
 (function testReflectConstructArity() {
   assertEquals(2, Reflect.construct.length);
 })();
@@ skipping 261 matching lines @@
                                          ["T", "E", "S", "T"]).a);
   assertEquals("TEST!!", Reflect.construct(sumSloppy,
                                            ["T", "E", "S", "T", "!", "!"]).a);
   assertEquals(10, Reflect.construct(sumSloppy,
                                      { 0: 1, 1: 2, 2: 3, 3: 4, length: 4 }).a);
 })();
 
 (function() {
   function* f() { yield 1; yield 2; }
   function* g() { yield 3; yield 4; }
-  var o = Reflect.construct(f, [], g);
-  assertEquals([1, 2], [...o]);
-  assertTrue(o.__proto__ === g.prototype);
-  assertTrue(o.__proto__ !== f.prototype);
+  assertThrows(()=>Reflect.construct(f, [], g));
 })();
 
 (function () {
   var realm1 = Realm.create();
   var realm2 = Realm.create();
 
   var well_known_intrinsic_constructors = [
       "Array",
       "ArrayBuffer",
       "Boolean",
@@ skipping 76 matching lines @@
       for (var realm of [realm1, realm2]) {
         test(realm, getname(intrinsic), getargs(intrinsic), convert);
       }
     }
   }
 
   test_all(test_intrinsic_default, (v)=>v);
   test_all(test_intrinsic_default,
            (v)=>{ "use strict"; return class extends v {}});
 })();