[llvm] [Bolt][Instrumentation] Initial instrumentation support for RISCV64 (PR #133882)

[Maksim Panchenko via llvm-commits]

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

Hi @WangJee, thank you for your contribution! The patch looks clean to me, but I'm not much familiar with RISC-V. Perhaps @dinyy can also chime in? I'm preliminary approving the patch to unblock your progress.

https://github.com/llvm/llvm-project/pull/133882