Function rapidrng_fast_not_portable 

pub fn rapidrng_fast_not_portable(seed: &mut u64) -> u64

A lower quality version of rapidrng_fast with that’s slightly faster, with optimisations for u32 platforms and those without wide-arithmetic support.

This is not a portable RNG, as it will produce different results on different platforms. Use rapidrng_fast if stable outputs are required.

Used in the rapidhash WASM benchmarks.