Add linalg.range_intersect conversion to LLVM.

    This CL adds lowering for linalg.range_intersect into LLVM by computing:
      * new_min <- max (range1.min, range2.min)
      * new_max <- min (range1.max, range2.max)
      * new_step <- range1.step * range2.step

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PiperOrigin-RevId: 248571810