[llvm] [AMDGPU] Add getCmpSelInstrCost override to re-enable SimplifyCFG speculation for vector types (PR #208043)

[Frederik Harwath via llvm-commits]

================

----------------
frederik-h wrote:

Good spot. All of this is taken with minor adjustments (specialization) from the base implementation. I also thought that Extract should be true (also in the base implementation) when I saw this but it seems I forgot to adjust it.

https://github.com/llvm/llvm-project/pull/208043