avoid some extra work

Author: zloirock

packages/core-js/internals/object-to-array.js

@@ -11,7 +11,7 @@ var push = uncurryThis([].push);
 
 // in some IE versions, `propertyIsEnumerable` returns incorrect result on integer keys
 // of `null` prototype objects
-var IE_BUG = fails(function () {
+var IE_BUG = DESCRIPTORS && fails(function () {
   // eslint-disable-next-line es/no-object-create -- safe
   var O = Object.create(null);
   O[2] = 2;