[llvm] [LV][NFC] Fix "vectorization is possible but not beneficial" message (PR #228024)

[David Sherwood via llvm-commits]

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@@ -91,7 +91,7 @@ loop.end:
 define i64 @vectorization_not_profitable_due_to_trunc(ptr dereferenceable(800) %src) {
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david-arm wrote:

Looks like this test was changed by https://github.com/llvm/llvm-project/pull/158690

https://github.com/llvm/llvm-project/pull/228024