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

[Pengcheng Wang via llvm-commits]

wangpc-pp 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.

Thanks! I will ask @BoyaoWang430 to add some MIR tests. And thanks in advance if you can help to evaluate/review this PR. :-)

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