Andreas Kling c9f0f0fc70 LibJS: Elide empty lexical environment in for..in/of blocks ...

When all the variables in a for..in/of block's lexical scope have been
turned into locals, we don't need to create and immediately abandon an
empty environment for them.

This avoid environment allocation in cases like this:

    function foo(a) {
        for (const x of a) {
        }
    }

2023-12-07 10:52:57 +01:00

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