Object spread causes polyfills even in modern language_out

Version: From at least mid 2022 up to latest.

compilation_level ADVANCED
language_out ECMASCRIPT_2020
rewrite_polyfills false

With ES2020 and up, using `{x:foo, ...bar}` causes this to be added to the head:

```js
var ba="function"==typeof Object.defineProperties?Object.defineProperty:function(a,b,c){if(a==Array.prototype||a==Object.prototype)return a;a[b]=c.value;return a};function ca(a){a=["object"==typeof globalThis&&globalThis,a,"object"==typeof window&&window,"object"==typeof self&&self,"object"==typeof global&&global];for(var b=0;b