MIPS: Implement isAsCheapAsAMove for addiu #133273
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Set `addiu` as `isAsCheapAsAMove` only when the src register or imm is zero only. If other cases are set `isAsCheapAsAMove`, MachineLICM will reject to hoist it.
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Set
addiuasisAsCheapAsAMoveonly when the src register or imm is zero only.If other cases are set
isAsCheapAsAMove, MachineLICM will reject to hoist it.