[llvm] [RISCV] Add load/store clustering in post machine schedule (PR #111504)

[Alex Bradbury via llvm-commits]

asb wrote:

> > createGenericSchedLive
> 
> I think the reason is you are using pre-ra scheduler here.

Thank you - the problem was indeed me being too eager with copy and paste and failing to switch to `createGenericSchedPostRA`. Now I've done that though, I see zero codegen changes within the in-tree unit tests.

https://github.com/llvm/llvm-project/pull/111504