[llvm] [LV] Move check if any vector insts will be generated to VPlan. (PR #96622)

[via llvm-commits]

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@@ -1,4 +1,4 @@
-; RUN: opt < %s -passes=loop-vectorize -S | FileCheck %s
+; RUN: opt < %s -passes=loop-vectorize -force-vector-width=4 -S | FileCheck %s
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ayalz wrote:

Indeed good to retain behavior. Is the not-generating-any-vectors-due-to-dead-instructions intentional?

https://github.com/llvm/llvm-project/pull/96622