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

[Mikhail R. Gadelha via llvm-commits]

mikhailramalho wrote:

We don't have a case to test that, as the assertion I removed only failed when building blender_r. I plan to run creduce and add a new test case for it before I merge this PR

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