[clang] [llvm] [RISCV] SiFive CLIC Support (PR #132481)

[Sam Elliott via cfe-commits]

lenary wrote:

I've resolved the merge conflict so I can merge this, now I'm back at work after some travel. I'll let some pre-commit checks run before I finally hit merge though.

https://github.com/llvm/llvm-project/pull/132481