[llvm] [RISCV] Fix the disassembler's handling of C.LUI when imm=0 (PR #133450)

[Paul Bowen-Huggett via llvm-commits]

paulhuggett wrote:

Thank you. Assuming you're happy, would you be kind enough to merge it for me, please?

https://github.com/llvm/llvm-project/pull/133450