[llvm] [RISC-V] Support fixed vector type for inline asm (#117098) (PR #117100)

[Zhijin Zeng via llvm-commits]

zengdage wrote:

> This kind of seems like a frontend bug. Why did clang pass it as a fixed vecor? Removing `__attribute__((riscv_rvv_vector_bits(__riscv_v_fixed_vlen * lmul)))` works as expected.

Do you mean that all the inline asm parameters should be scalable vector types rather than fixed vector types? So I need to fix why clang pass fixed vector types to inline asm?

https://github.com/llvm/llvm-project/pull/117100