[llvm] [VPlan] Account for dead FOR splice simplification in cost model (PR #131486)

[Florian Hahn via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
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fhahn wrote:

might be worth using a slightly more descriptive name for the file, e.g. `llvm/test/Transforms/LoopVectorize/X86/pr131359-dead-for-splice.ll

https://github.com/llvm/llvm-project/pull/131486