[llvm] [llvm][RISCV] Implement Zilsd load/store pair optimization (PR #158640)

[Brandon Wu via llvm-commits]

4vtomat wrote:

> Great to see someone is contributing this work, as we have looked forward to having it too.
> 
> I have a few high-level comments, which I don't think are covered by Craig's review, and might supersede his comments:
> 
> Is this based on the NXP Patches against LLVM 18? If so, this will need appropriate Co-authored-by. Even if it isn't, I will add @anmolparalkar-nxp as a reviewer as he is familiar with that work.

No I started this from scratch, I didn't even notice there's existing one lol


https://github.com/llvm/llvm-project/pull/158640