[VPlan] Return invalid for scalable VF in VPReplicateRecipe::computeCost Replication is currently not supported for scalable VFs. Make sure VPReplicateRecipe::computeCost returns an invalid cost early, for scalable VFs if the recipe is not a single-scalar. Note that this moves the existing invalid-costs.ll out of the AArch64 subdirectory, as it does not use a target triple. Fixes https://github.com/llvm/llvm-project/issues/160792.
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