[ir] Make statements final, and change IRNode::as to use static_cast#7896
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bobcao3 wants to merge 2 commits intotaichi-dev:masterfrom
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[ir] Make statements final, and change `IRNode::as` to use `static_cast`#7896bobcao3 wants to merge 2 commits intotaichi-dev:masterfrom
bobcao3 wants to merge 2 commits intotaichi-dev:masterfrom
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