[WIP]Fix black_box on benchmarks

[teofr]

This PR addresses this comment #1572 (comment) (and similar ones). It makes sure that every function being benchmarked has its arguments and its result wrapped around black_box, to avoid any optimizations to skew results.

Testing

• comparison benchmark run https://github.com/NomicFoundation/slang/actions/runs/23648845399
• slang benchmark run https://github.com/NomicFoundation/slang/actions/runs/23648873848

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Latest commit: 77a367b

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