fix possible early error in get-iterator-method helper

CHANGELOG.md

@@ -1,6 +1,7 @@
 # Changelog
 ### Unreleased
 - Fixed possible crash on some keys in `Symbol.for`
+- Fixed possible early error in `get-iterator-method` helper
 - Improved the way of inner iterators cleaning in iterator helpers
 - Improved accuracy of `Math.asinh` polyfill
 - Improved performance of `Uint8Array` base64 methods

packages/core-js/internals/get-iterator-method.js

@@ -1,6 +1,5 @@
 'use strict';
 var classof = require('../internals/classof');
-var getMethod = require('../internals/get-method');
 var isNullOrUndefined = require('../internals/is-null-or-undefined');
 var Iterators = require('../internals/iterators');
 var wellKnownSymbol = require('../internals/well-known-symbol');
@@ -8,7 +7,7 @@ var wellKnownSymbol = require('../internals/well-known-symbol');
 var ITERATOR = wellKnownSymbol('iterator');
 
 module.exports = function (it) {
-  if (!isNullOrUndefined(it)) return getMethod(it, ITERATOR)
-    || getMethod(it, '@@iterator')
+  if (!isNullOrUndefined(it)) return it[ITERATOR]
+    || it['@@iterator']
     || Iterators[classof(it)];
 };