[llvm] [AArch64][CostModel] Improve cost estimate of scalarizing a vector di… (PR #118055)

[Alexey Bataev via llvm-commits]

https://github.com/alexey-bataev requested changes to this pull request.

Scalarized nodes must be represented as buildvectors. If the operands should be vectorized, need to add special processing for such operands. Vectorizing `must be scalarized` nodes comes against design of the vectorizer.

https://github.com/llvm/llvm-project/pull/118055