Add baseGetTag helper.

lodash.js

@@ -2714,6 +2714,17 @@
       return isArray(object) ? result : arrayPush(result, symbolsFunc(object));
     }
 
+    /**
+     * The base implementation of `getTag`.
+     *
+     * @private
+     * @param {*} value The value to query.
+     * @returns {string} Returns the `toStringTag`.
+     */
+    function baseGetTag(value) {
+      return objectToString.call(value);
+    }
+
     /**
      * The base implementation of `_.gt` which doesn't coerce arguments to numbers.
      *
@@ -5485,9 +5496,7 @@
      * @param {*} value The value to query.
      * @returns {string} Returns the `toStringTag`.
      */
-    function getTag(value) {
+    var getTag = baseGetTag;
-      return objectToString.call(value);
-    }
 
     // Fallback for data views, maps, sets, and weak maps in IE 11,
     // for data views in Edge, and promises in Node.js.