Bug 17030 – Specialize range functions for isSortedRange

If a range is sorted, range algorithms should take advantage of it. For a motivation you may also read: https://github.com/dlang/phobos/pull/3534 Since three weeks `find` has a specialization for SortedRanges https://github.com/dlang/phobos/pull/4907 and more functions could take advantage of a similar behavior (e.g. minPos, minElement, minIndex, isSorted, ...) Moreover I would like to stress that at the moment the comparison is done with a string lambda, which means that for user-defined lambdas we can't take any advantage at the moment.

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