Mismatched bfloat16 autogenerated files

[dzaima]

Running make bf16-all I get it generating incorrect reinterpret instructions like __riscv_reinterpret_v_bf16m8_i16m8.

Note the lack of v prefix there, which matches no v in ["reinterpret"] in bfloat16_inst.py.

[kito-cheng]

@4vtomat could you take a look for this issue?

[dzaima]

Somewhat-relatedly, all _vf_ widening float multiply-add intrinsics, e.g. __riscv_vfwmacc_vf_f32m1 (not just, but including, bfloat16 ones) name their scalar arguments vs1 where I think it should be rs1. This appears to have been the case for a while.

[4vtomat]

Thanks @dzaima , let me take this!