[es6] Define generator prototype as writable prop

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 72a47d0fb093c567641ad3b80d07796a5bdcaf94..747236d5c54b122bceb945e9cb33a05cd9514c8c 100644
--- a/test/mjsunit/es6/generators-runtime.js
+++ b/test/mjsunit/es6/generators-runtime.js
@@ -52,16 +52,9 @@ function TestGeneratorFunctionInstance() {
     var prop = f_own_property_names[i];
     var f_desc = Object.getOwnPropertyDescriptor(f, prop);
     var g_desc = Object.getOwnPropertyDescriptor(g, prop);
-    if (prop === "prototype") {
-      // ES6 draft 03-17-2015 section 25.2.2.2
-      assertFalse(g_desc.writable, prop);
-      assertFalse(g_desc.enumerable, prop);
-      assertFalse(g_desc.configurable, prop);
-    } else {
-      assertEquals(f_desc.configurable, g_desc.configurable, prop);
-      assertEquals(f_desc.writable, g_desc.writable, prop);
-      assertEquals(f_desc.enumerable, g_desc.enumerable, prop);
-    }
+    assertEquals(f_desc.configurable, g_desc.configurable, prop);
+    assertEquals(f_desc.writable, g_desc.writable, prop);
+    assertEquals(f_desc.enumerable, g_desc.enumerable, prop);
   }
 }
 TestGeneratorFunctionInstance();