[llvm] [CostModel] Estimate the codesize cost of switch (PR #163569)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

This looks reasonable to me, but why does this impact vectorization tests? Do those use the CodeSize model even when not optimizing for size?

https://github.com/llvm/llvm-project/pull/163569