[llvm] [LoopVectorize] LLVM fails to vectorise loops with multi-bool varables (PR #89226)

[Sam Tebbs 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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SamTebbs33 wrote:

The comments are useful but I meant that you could commit the tests to main and rebase this PR on top of that so that we can see the difference this PR makes. Florian made a similar suggestion but with a new PR instead of committing straight to main.

https://github.com/llvm/llvm-project/pull/89226