[MachinePipeliner] Introduce a new class for loop-carried deps (#137663) In MachinePipeliner, loop-carried memory dependencies are represented by DAG, which makes things complicated and causes some necessary dependencies to be missing. This patch introduces a new class to manage loop-carried memory dependencies to simplify the logic. The ultimate goal is to add currently missing dependencies, but this is a first step of that, and this patch doesn't intend to change current behavior. This patch also adds new tests that show the missed dependencies, which should be fixed in the future. Split off from #135148
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