[lld] [llvm] [RISCV] Support RISCV Atomics ABI attributes (PR #84597)

[Paul Kirth via llvm-commits]

ilovepi wrote:

@MaskRay @asb Are we happy w/ this patch? I think I've addressed most of the concerns raised thus far, but I want try and finish the attributes patches this week if possible, since I'm back from EuroLLVM + vacation.

https://github.com/llvm/llvm-project/pull/84597