[llvm] [RISCV] Rename operands used for branch and compressed jump targets. NFC (PR #133364)

[Fangrui Song via llvm-commits]

MaskRay wrote:

I've recently looked into this. Actually I don't think `bare_symbol` is a good name. Its presence seems mostly to avoid parsing ambiguity due to many strange aliases.

https://github.com/llvm/llvm-project/pull/133364