[clang] [flang] [llvm] [OpenMP] Make OpenMP version have separate type (PR #219820)

[Alexey Bataev via cfe-commits]

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alexey-bataev wrote:

```suggestion
  if (DirLang.getName() == "OpenMP")
    OS << "#include \"llvm/Frontend/OpenMP/OMPVersion.h\"\n";
```

https://github.com/llvm/llvm-project/pull/219820