[llvm] [RISCV] Support printing immediate of RISCV MCInst in hexadecimal format (PR #74053)

[Wang Pengcheng via llvm-commits]

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

LGTM! One question: is this bahavior the same as current GNU toolchain?

https://github.com/llvm/llvm-project/pull/74053