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

[via llvm-commits]

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