libclc: clspv: update gen_convert.cl for clspv (#66902) Add a clspv switch in gen_convert.cl This is needed as Vulkan SPIR-V does not respect the assumptions needed to have the generic convert.cl compliant on many platforms. It is needed because of the conversion of TYPE_MAX and TYPE_MIN. Depending on the platform the behaviour can vary, but most of them just do not convert correctly those 2 values. Because of that, we also need to avoid having explicit function for simple conversions because it allows llvm to optimise the code, thus removing some of the added checks that are in fact needed.
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