[llvm] [MachinePipeliner] Limit the number of stores in BB (PR #154940)

[via llvm-commits]

aankit-ca wrote:

> @aankit-ca Ah, I see. Thanks for checking. I don't need a reproducer for this case, I'll consider a different approach. Instead, if possible, could you share the number of load and store instructions separately for each regression case?

I'm re-running the tests to get the load-store numbers

https://github.com/llvm/llvm-project/pull/154940