Turbopack: constant evaluate `x in y` (#95286)
Prerequisite for https://github.com/vercel/next.js/pull/95233
Constant evaluation of
```js
if (!('NODE_ENV' in process.env)) {
console.log('existing')
}
console.log('NODE_ENV' in process.env)
```
->
```js
if ("TURBOPACK compile-time falsy", 0) //TURBOPACK unreachable
;
console.log(("TURBOPACK compile-time value", true));
```
