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fix the error of generating cpu operations #21607

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fix the error of generating cpu operations #21607

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@Xinlong-Wu Xinlong-Wu commented Jan 18, 2023

in the file mini-ops.h, TARGET_ARM64 has defined following OPs:

#ifdef TARGET_ARM64
MINI_OP(OP_LSCNT32, "lscnt32", IREG, IREG, NONE)
MINI_OP(OP_LSCNT64, "lscnt64", LREG, LREG, NONE)
MINI_OP(OP_ARM64_SMULH, "arm64_smulh", LREG, LREG, LREG)
MINI_OP(OP_ARM64_UMULH, "arm64_umulh", LREG, LREG, LREG)
#endif // TARGET_ARM64

but genmdesc.py can't parse it correctly and these four OPs will be generated in every arch.

This patch try to fix it

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@vargaz vargaz Awaiting requested review from vargaz

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