Use correct property descriptor in generators test

test/mjsunit/es6/generators-runtime.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 112 matching lines @@
 
   var next_desc = Object.getOwnPropertyDescriptor(GeneratorObjectPrototype,
       "next");
   assertTrue(next_desc !== undefined);
   assertTrue(next_desc.writable);
   assertFalse(next_desc.enumerable);
   assertTrue(next_desc.configurable);
 
   var throw_desc = Object.getOwnPropertyDescriptor(GeneratorObjectPrototype,
       "throw");
-  assertTrue(next_desc !== undefined);
-  assertTrue(next_desc.writable);
-  assertFalse(next_desc.enumerable);
-  assertTrue(next_desc.configurable);
+  assertTrue(throw_desc !== undefined);
+  assertTrue(throw_desc.writable);
+  assertFalse(throw_desc.enumerable);
+  assertTrue(throw_desc.configurable);
 
   var iterator_desc = Object.getOwnPropertyDescriptor(GeneratorObjectPrototype,
       Symbol.iterator);
   assertTrue(iterator_desc !== undefined);
   assertFalse(iterator_desc.writable);
   assertFalse(iterator_desc.enumerable);
   assertFalse(iterator_desc.configurable);
 
   // The generator object's "iterator" function is just the identity.
   assertSame(iterator_desc.value.call(42), 42);
@@ skipping 25 matching lines @@
 function TestPerGeneratorPrototype() {
   assertTrue((function*(){}).prototype !== (function*(){}).prototype);
   assertTrue((function*(){}).prototype !== g.prototype);
   assertSame(GeneratorObjectPrototype, Object.getPrototypeOf(g.prototype));
   assertTrue(!(g.prototype instanceof Function));
   assertSame(typeof (g.prototype), "object");
 
   assertArrayEquals([], Object.getOwnPropertyNames(g.prototype));
 }
 TestPerGeneratorPrototype();