[llvm] [SelectionDAG][RISCV] Avoid store merging across function calls (PR #130430)

[Mikhail R. Gadelha via llvm-commits]

mikhailramalho wrote:

> > This patch improves DAGCombiner's handling of potential store merges by
> > detecting function calls between loads and stores.
> 
> I'm surprised this even happens. What happens if you just do this unconditionally?

We want to still allow merging scalars... If we prevent merges unconditionally, we would miss that

Luke requested a test case for when we merge scalars, I'm working on it now and will add it to the PR soon

https://github.com/llvm/llvm-project/pull/130430