[llvm] [RISCV] Separate more of scalar FP in CC_RISCV. (PR #107908)

[Pengcheng Wang via llvm-commits]

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

LGTM. Much more clear to me!
(Should be a NFC?)

https://github.com/llvm/llvm-project/pull/107908