[clang] [llvm] [RISCV] Add Smcsrind and Sscsrind extension (PR #93952)

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YanWQ-monad wrote:

My bad. I though they have the same CSRs as Smcsrind/Sscsrind originate from Smaia/Ssaia.

https://github.com/llvm/llvm-project/pull/93952