[clang] [llvm] [Clang][OpenMP] Implement Loop splitting `#pragma omp split` directive (PR #183261)

[Michael Kruse via llvm-commits]

================
@@ -6065,6 +6065,83 @@ class OMPFuseDirective final
   }
 };
 
+/// Represents the '#pragma omp split' loop transformation directive.
+///
+/// \code{c}
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Meinersbur wrote:

```suggestion
/// \code{.c}
```
https://www.doxygen.nl/manual/commands.html#cmdcode

https://github.com/llvm/llvm-project/pull/183261