[llvm] [LoopVectorize] Improve Vectorization of Low Trip Count Loops (PR #195823)

[Sander de Smalen via llvm-commits]

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sdesmalen-arm wrote:

nit: 1 scalar iteration remains when `TC.getFixedValue() - MaxVFForTC == 1`, but not when `TC.getFixedValue() - MaxVFForTC == 0`, so either this part of the message needs to be conditional, or you it must be rephrased as "at most 1 scalar iteration".

https://github.com/llvm/llvm-project/pull/195823