[stdlib] Make unavailable protocol implementation @_alwaysEmitIntoClient
#1
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…and add a comment about use of Lemire's nearly divisionless method.
In follow-up to swiftlang#38161, make the clever recursion-breaking protocol implementation
@_alwaysEmitIntoClientin addition to being unavailable. Additionally, in follow-up to swiftlang#25286, add a brief comment in the code about the use of Lemire's nearly divisionless method; the code is very neat but without any comment a reader who is unfamiliar with the algorithm has no easy way of understanding what's going on.