[llvm] [LLVM][RISCV][BF16] Support Inline ASM for the bf16 type. (PR #80118)

[Wang Pengcheng via llvm-commits]

wangpc-pp wrote:

You don't need `[LLVM]` in title, and maybe `[BF16]` as well since the title contains it.

https://github.com/llvm/llvm-project/pull/80118