[runtime] [proxy] Fix Object.prototype.propertyIsEnumerable to support proxies

src/js/v8natives.js

Index: src/js/v8natives.js
diff --git a/src/js/v8natives.js b/src/js/v8natives.js
index 711a22fe64ca8e0a43aecf2fe8aaed46bc066d14..97ace80ef8f2b9b81fb8029619e091827e7452af 100644
--- a/src/js/v8natives.js
+++ b/src/js/v8natives.js
@@ -207,16 +207,9 @@ function ObjectIsPrototypeOf(V) {
 }
 
 
-// ECMA-262 - 15.2.4.6
+// ES6 19.1.3.4
 function ObjectPropertyIsEnumerable(V) {
   var P = TO_NAME(V);
-  if (%_IsJSProxy(this)) {
-    // TODO(rossberg): adjust once there is a story for symbols vs proxies.
-    if (IS_SYMBOL(V)) return false;
-
-    var desc = GetOwnPropertyJS(this, P);
-    return IS_UNDEFINED(desc) ? false : desc.isEnumerable();
-  }
   return %IsPropertyEnumerable(TO_OBJECT(this), P);
 }