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b3713db4ab
Error about not-initialized `x` variable access should be thrown for:
```js
function foo() {
x = 69;
let x;
}
foo();
```
Progress on test262:
```
Diff Tests:
test/staging/sm/expressions/optional-chain-tdz.js ❌ -> ✅
test/staging/sm/expressions/short-circuit-compound-assignment-tdz.js
❌ -> ✅
```
Fixes https://github.com/LadybirdBrowser/ladybird/issues/4587