[clang] [clang][OpenMP] Regenerate stale checks in two codegen tests (NFC) (PR #232041)

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pgerell wrote:

@alexey-bataev Thanks for the approval. I rebased onto main. Three of the five tests had already been regenerated there, so the PR now covers only `single_codegen.cpp` and `threadprivate_codegen.cpp`. As I don't have commit access, could you merge this for me?

https://github.com/llvm/llvm-project/pull/232041