Remove overwriting of JSON.stringify

[GillesPl]

The library overwrites the JSON.stringify function on compilation. This has a negative impact on performance.

// 24.3.2 JSON.stringify(value [, replacer [, space]])
$JSON && $export($export.S + $export.F * (!USE_NATIVE || $fails(function () {
var S = $Symbol();
// MS Edge converts symbol values to JSON as {}
// WebKit converts symbol values to JSON as null
// V8 throws on boxed symbols
return _stringify([S]) != '[null]' || _stringify(

{ a: S }
) != '{}' || _stringify(Object(S)) != '{}';
})), 'JSON', {
stringify: function stringify(it) {
var args = [it];
var i = 1;
var replacer, $replacer;
while (arguments.length > i) args.push(arguments[i++]);
$replacer = replacer = args[1];
if (!isObject(replacer) && it === undefined || isSymbol(it)) return; // IE8 returns string on undefined
if (!isArray(replacer)) replacer = function (key, value)

{ if (typeof $replacer == 'function') value = $replacer.call(this, key, value); if (!isSymbol(value)) return value; }
;
args[1] = replacer;
return _stringify.apply($JSON, args);
}
});