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

[Paul Kirth via llvm-commits]

ilovepi wrote:

@jrtc27 Do you have thoughts on this change w.r.t. the defaults? I recall you had expressed concerns previously in the psABI, so I want to be sure we're changing the status quo appropriately.

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