[llvm] [SPIR-V] Type inference must realize that a <1 x Type> vector type is not a legal vector type in LLT (PR #124560)

[Vyacheslav Levytskyy via llvm-commits]

https://github.com/VyacheslavLevytskyy ready_for_review https://github.com/llvm/llvm-project/pull/124560