[compiler-rt] [llvm] [RISCV] Allocate Feature Bits for Zilsd/Zclsd/Zcmp (PR #135197)

[Pengcheng Wang via llvm-commits]

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

LGTM but is it right to land this before kernel supports?

https://github.com/llvm/llvm-project/pull/135197