Correct property descriptors on GeneratorPrototype

test/mjsunit/es6/generators-runtime.js

Index: test/mjsunit/es6/generators-runtime.js
diff --git a/test/mjsunit/es6/generators-runtime.js b/test/mjsunit/es6/generators-runtime.js
index 8fa70b62e0f5a691ed84e55be3d6e661ee428013..142da410044f06e7f5eec48d4ee3d1fe512b60c8 100644
--- a/test/mjsunit/es6/generators-runtime.js
+++ b/test/mjsunit/es6/generators-runtime.js
@@ -99,7 +99,28 @@ function TestGeneratorObjectPrototype() {
 
   assertArrayEquals(expected_property_names, found_property_names);
 
-  iterator_desc = Object.getOwnPropertyDescriptor(GeneratorObjectPrototype,
+  var constructor_desc = Object.getOwnPropertyDescriptor(
+      GeneratorObjectPrototype, "constructor");
+  assertTrue(constructor_desc !== undefined);
+  assertFalse(constructor_desc.writable);
+  assertFalse(constructor_desc.enumerable);
+  assertTrue(constructor_desc.configurable);
+
+  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);
+
+  var iterator_desc = Object.getOwnPropertyDescriptor(GeneratorObjectPrototype,
       Symbol.iterator);
   assertTrue(iterator_desc !== undefined);
   assertFalse(iterator_desc.writable);