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[AMDGPU] Fix sign confusion in performMulLoHiCombine (#105831)
SMUL_LOHI and UMUL_LOHI are different operations because the high part of the result is different, so it is not OK to optimize the signed version to MUL_U24/MULHI_U24 or the unsigned version to MUL_I24/MULHI_I24.
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