[llvm] [feature][riscv] handle target address calculation in llvm-objdump disassembly for riscv (PR #144620)

[James Henderson via llvm-commits]

https://github.com/jh7370 commented:

Couple of nits from me.

This needs @MaskRay to approve, since he requested changes originally.

https://github.com/llvm/llvm-project/pull/144620