Use slice::chunks on Windows #856
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We can do the same overflow check but in a much more readable/efficient way. This also helps toward overall simplification of
rand.rsand the eventual elimination ofmod sysrand_chunk(see followup).Also removes
polyfill::usize_from_u32as we already check compatiblity in theassert!()(so we know theascast is safe). We should probably cleanuppolyfillanyway, as most of the proposed features have gone in a different direction or are unlikely to ever be stabilized.