[llvm] [SPIRV] Implement bare bones lowering for G_PREFETCH (PR #215505)

[Mariya Podchishchaeva via llvm-commits]

Fznamznon wrote:

CI fails appear to be unrelated and fail for other PRs too and I might have seen an attempt to fix them. So, merging, thanks for reviews!

https://github.com/llvm/llvm-project/pull/215505