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9e832a67fe
An instruction is a meta-instruction if it doesn't produce any output in the form of executable instructions. So in the concept, a meta-instruction does not have to be target independent. Before this patch, `isMetaInstruction` is implemented by checking the opcode of the instruction, add we have no way to add target dependent opcode to the list, which does not make sense. After this patch, a bit `isMeta` is added for class `Instruction` in tablegen, which is used to indicate whether it's a meta instruction. Reviewed By: pengfei Differential Revision: https://reviews.llvm.org/D121600
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