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hi, currently, the DAGCombiner unconditionally converts (DAGCombiner::visit(U|S)REM) expressions of the form X % C for constants C into X-X/C*C. this makes sense in certain cases where the div/mul logic will simplify X/C*X but is counterproductive in general, especially if the multiply is expensive. also, this doesn't allow targets to custom lower rem operations. shouldn't this