Stabilize const for integer {to,from}_{be,le,ne}_bytes methods

All of these functions can be implemented simply and naturally as
const functions, e.g. u32::from_le_bytes can be implemented as

    (bytes[0] as u32)
        | (bytes[1] as u32) << 8
        | (bytes[2] as u32) << 16
        | (bytes[3] as u32) << 24

So stabilizing the constness will not expose that internally they are
implemented using transmute which is not const in stable.

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