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

[David Sherwood via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
+; RUN: opt -S < %s -p loop-vectorize -mattr=+sve -debug-only=loop-vectorize \
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david-arm wrote:

Sure, seems reasonable. We will need a few SVE specific tests once we start vectorising these loops just to ensure the cost model decides it's worth vectorising, but that's fine!

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