A LUI instruction with flag RISCVII::MO_HI is usually used in conjunction with ADDI, and jointly
complete address computation. To bind the cost evaluation of address computation, the LUI
should not be regarded as a cheap move separately, which is consistent with ADDI.
In this test case, it improves the unroll-loop code that the rematerialization of array's base address
miss MachineCSE with Heuristics #1 at isProfitableToCSE.