[llvm-branch-commits] [llvm] [llvm-mc] Add a Clang-style --verify option (PR #227569)

[Fangrui Song via llvm-branch-commits]

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+## Tests for llvm-mc's --verify diagnostic-verification mode.
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MaskRay wrote:

For general features use X86 and avoid RISCV

https://github.com/llvm/llvm-project/pull/227569