[clang] [llvm] [RISCV] Support resumable non-maskable interrupt handlers (PR #148134)

[Sam Elliott via llvm-commits]

https://github.com/lenary commented:

The implementation here is good, and can be landed once there's a PR against the riscv-c-api with some consensus. I don't think the chosen name will be controversial.

https://github.com/llvm/llvm-project/pull/148134