RISC-V RVV intrinsics are missing

[nazar-pc]

I think https://github.com/riscv-non-isa/rvv-intrinsic-doc is the place to get them, v1.0 was ratified on April 25 2025. It would be really nice to get them into standard library now that RISC-V hardware becomes more common and there are various RISC-V-based VMs out there (for example in blockchain space).