[llvm] [RISCV][MC] Reject invalid combined immediates for cv.insert in the disassembler (PR #225269)

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@llvm/pr-subscribers-backend-risc-v

Author: Zeyi Xu (zeyi2)

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<summary>Changes</summary>

Follow up of #<!-- -->224985

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Full diff: https://github.com/llvm/llvm-project/pull/225269.diff


3 Files Affected:

- (modified) llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp (+9) 
- (modified) llvm/lib/Target/RISCV/RISCVInstrInfoXCV.td (+5-1) 
- (added) llvm/test/MC/Disassembler/RISCV/xcvbitmanip-invalid.txt (+17) 


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https://github.com/llvm/llvm-project/pull/225269