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

[Mikhail R. Gadelha via llvm-commits]

mikhailramalho wrote:

> LGTM to me too. It would be nice to update hasCallInLdStChain to only check the first load/store pair but that's an optimisation, feel free to leave it to another PR if you want

It's a small change, so I'll update the PR and re-run the tests just to be sure

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