Add checks before hoisting out in loop pipelining (#90872) Currently, during a loop pipelining transformation, operations may be hoisted out without any checks on the loop bounds, which leads to incorrect transformations and unexpected behaviour. The following [issue ](https://github.com/llvm/llvm-project/issues/90870) describes the problem more extensively, including an example. The proposed fix adds some check in the loop bounds before and applies the maximum hoisting.
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