Revert of [builtins] Migrate Object.getOwnPropertyDescriptor to C++.

src/js/v8natives.js

Index: src/js/v8natives.js
diff --git a/src/js/v8natives.js b/src/js/v8natives.js
index f1c5f838b4110c7cea5464ed918da57243c4017d..26447dac5de4d8169c891b105c8897b49aa78af9 100644
--- a/src/js/v8natives.js
+++ b/src/js/v8natives.js
@@ -772,6 +772,12 @@
 }
 
 
+// ES6 section 19.1.2.6
+function ObjectGetOwnPropertyDescriptor(obj, p) {
+  return %GetOwnProperty(obj, p);
+}
+
+
 // ES5 section 15.2.3.4.
 function ObjectGetOwnPropertyNames(obj) {
   obj = TO_OBJECT(obj);
@@ -883,6 +889,7 @@
   "defineProperties", ObjectDefineProperties,
   "getPrototypeOf", ObjectGetPrototypeOf,
   "setPrototypeOf", ObjectSetPrototypeOf,
+  "getOwnPropertyDescriptor", ObjectGetOwnPropertyDescriptor,
   "getOwnPropertyNames", ObjectGetOwnPropertyNames,
   // getOwnPropertySymbols is added in symbol.js.
   "is", SameValue,  // ECMA-262, Edition 6, section 19.1.2.10