[llvm] [AArch64][LoopVectorize] Use either fixed-width or scalable VF when tail-folding (PR #67543)

[Matthew Devereau via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
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MDevereau wrote:

nit: This comment isn't true anymore

https://github.com/llvm/llvm-project/pull/67543