[llvm] [LV] Transform to handle exits in the scalar loop (PR #148626)

[Gaëtan Bossu via llvm-commits]

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gbossu wrote:

Is it because `%index` is used by multiple instructions? Generally, it would be useful to add a quick comment for each of these cases to explain why the new strategy does not kick in.

https://github.com/llvm/llvm-project/pull/148626