[llvm] [RISCV] Correct the predicate for the ror and rorw with immediate InstAliases. (PR #157921)

[Philip Reames via llvm-commits]

https://github.com/preames approved this pull request.

LGTM

Possibly followup: Is there a way in tablegen to derive a predicate from another instruction?  That is, say "the predicate for the alias is whatever the predicate for RORI is"?  

https://github.com/llvm/llvm-project/pull/157921