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DAGCombiner::ReduceLoadWidth() does the following: /// ReduceLoadWidth - If the result of a wider load is shifted to right of N /// bits and then truncated to a narrower type and where N is a multiple /// of number of bits of the narrower type, transform it to a narrower load /// from address + N / num of bits of new type. If the result is to be /// extended, also fold the extension to form a