[llvm] [Exegesis][RISCV] Add RISCV support for llvm-exegesis (PR #89047)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 requested changes to this pull request.

There are a couple of requests that seem like they got lost. I have one on `SnippetFile.cpp` that looks like it could be pulled out. There's also an outstanding request to move some code in `SerialSnippetGenerator.cpp` to a separate PR for easier review. Are you able to either do that or give a better explanation on why it can't be pulled out?

https://github.com/llvm/llvm-project/pull/89047