[llvm] [RISCV] Remove experimental- prefix for smaia and ssaia. (PR #71172)

[Kito Cheng via llvm-commits]

https://github.com/kito-cheng approved this pull request.

Checked spec has tagged with 1.0 https://github.com/riscv/riscv-aia/releases/tag/1.0 also spec status has updated to ratified
 https://wiki.riscv.org/display/HOME/Specification+Status

So I think that give us confidence to say it's ratified and no longer experimental.

LGTM.

https://github.com/llvm/llvm-project/pull/71172