Andreas Kling d0df7c8c62 LibJS: Use [[likely]] annotations for cached environment lookups ...

These will generally be cached the vast majority of the time except on
first encounter, and sprinkling [[likely]] gives us a nice boost.

1.10x speed-up on this micro-benchmark:

    (() => {
        var a = 3;
        for (let i = 0; i < 100_000_000; ++i) { a; }
        eval("");
    })();

2025-10-07 23:50:51 +02:00

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