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

[Michael Kruse via cfe-commits]

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

`counts` clause is mandatory

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