[SPIR-V] Type inference must realize that a <1 x Type> vector type is not a legal vector type in LLT #124560
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In this PR we account for possible <1 x LLVM Type> input to ensure that we produce legal vector types during type inference.
We modify an LLVM type to conform with future transformations in IRTranslator, if it's a <1 x Type> vector type, replacing it by the element type, because <1 x Type> vector type is not a legal vector type in LLT and IRTranslator will represent it as the scalar eventually.