clamp function in base

[Sandy Maguire]

Hi all,

It seems to me that base is missing the very standard function `clamp ::
Ord a => a -> a -> a -> a`:

```haskell
clamp :: Ord a => a -> a -> a -> a
clamp low high = min high .max low
```

I propose it be added to Data.Ord. It's useful, generic, and non-trivial to
get right (the "big" number goes with "min" -- causes me cognitive
dissonance every time.)

Thanks,
Sandy
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