[llvm] [GitHub][RISCV] Restrict backend:RISC-V labelling to Clang and LLVM (PR #192429)

[Craig Topper via llvm-commits]

topperc wrote:

> > What about lld? Those changes generally would be specific to RISC-V.
> 
> Are they specific to the LLVM RISC-V backend though? I would have thought those interested in those changes would have subscribed to the lld label. But happy to add it in if we think there's enough overlap between developers.

They are often specific to RISC-V relocations which is related to the MC layer part of the backend in LLVM.

https://github.com/llvm/llvm-project/pull/192429