Spartan2909

Reexport std::hint::black_box

12

Fixes #700.

The `black_box` function can be replaced with `std::hint::black_box`

1

The function `std::hint::black_box` is a stable wrapper around the same intrinsic that `test::black_box` uses, and could replace Criterion's own `black_box` function on all release channels. This function has been stable...

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According to [Apple's documentation](https://developer.apple.com/documentation/xcode/writing-arm64-code-for-apple-platforms), their C data model seems to conform to LP64. [This Wikipedia article](https://en.wikipedia.org/wiki/64-bit_computing#64-bit_data_models) also says that macOS uses LP64. Unless I've missed something, it should be possible...