[clang] [llvm] [RISCV] Add Supm extension to RVA23 profiles (PR #113619)

[Pengcheng Wang via llvm-commits]

https://github.com/wangpc-pp approved this pull request.

LGTM.
(And it's time to mask RV[A|B|M]23 as non-experimental now?)

https://github.com/llvm/llvm-project/pull/113619