[llvm] [LoopVectorize] Introduce check-first vectorization for multiple early-exit loops (PR #210492)

[Arjun H Kumar via llvm-commits]

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arjun-harikumar-amd wrote:

It's copied purely to change the element type. But I can change `CondLoads` to `SmallPtrSet<const Instruction *, N>` and avoid the copy.

https://github.com/llvm/llvm-project/pull/210492