[llvm] [LoopVectorize] Teach LoopVectorizationLegality about more early exits (PR #107004)

[Florian Hahn via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
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fhahn wrote:

This will need REQUIRES:asserts I think

https://github.com/llvm/llvm-project/pull/107004