arrange to create prototypes for generators

test/mjsunit/builtins.js

Index: test/mjsunit/builtins.js
diff --git a/test/mjsunit/builtins.js b/test/mjsunit/builtins.js
index 062cfd5689de3aea6757f42bf949be2da9f2be02..ce2c6802f0716b4f1f57ccfb4fc3a8aa3c32aca9 100644
--- a/test/mjsunit/builtins.js
+++ b/test/mjsunit/builtins.js
@@ -54,7 +54,9 @@ function checkConstructor(func, name) {
   assertFalse(proto_desc.writable, name);
   assertFalse(proto_desc.configurable, name);
   var prototype = proto_desc.value;
-  assertEquals(null, Object.getPrototypeOf(prototype), name);
+  assertEquals(name == "GeneratorFunctionPrototype" ? Object.prototype : null,
+               Object.getPrototypeOf(prototype),
+               name);
   for (var i = 0; i < propNames.length; i++) {
     var propName = propNames[i];
     if (propName == "constructor") continue;