[clang] [llvm] [RISCV] Support bf16 vmv.v.v and vmerge.vvm intrinsics with `zvfbfmin` (PR #101611)

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joshua-arch1 wrote:

I'm wondering why we need these intrinsics since we do not have vmv.v.v and vmerge.vvm instructions for bf16. 

https://github.com/llvm/llvm-project/pull/101611