[llvm] [MachinePipeliner] Improve loop carried dependence analysis (PR #94185)

[Brian Cain via llvm-commits]

androm3da wrote:

> @quic-santdas @androm3da Could you approve this fix?

Sorry: I can't provide adequate review of this change, I'm not familiar with these elements.

Santanu or @iajbar should be able to review this.

https://github.com/llvm/llvm-project/pull/94185