Transform object keys causes error  #516

var passthrough = (object) => object;
var foo = {foo: 1},	
    bar = passthrough({bar: foo.foo});
console.log(bar.bar);

var passthrough = _0x15e948 => _0x15e948;
var _0x1193f7 = {};
_0x1193f7['foo'] = 0x1;
var _0x49746f = {};
_0x49746f['bar'] = foo['foo'];
var foo = _0x1193f7, bar = passthrough(_0x49746f);
console['log'](bar['bar']);

var passthrough = (object) => object;
function test (foo = {foo: 1}, bar = {bar: foo.foo}) {
    return bar.bar;
}
console.log(test());