[AMDGPU] Add 24-bit mulhi intrinsics in INTRINSIC_WO_CHAIN combine.
mul24 intrinsic's operands are simplified by AMDGPUTargetLowering::performIntrinsicWOChainCombine(). This change adds the mul24hi intrinsics in the combine since its operands can be simplified like that of the mul24 intrinsics. Differential Revision: https://reviews.llvm.org/D112702
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