[clang] [llvm] [openmp] [Clang][OpenMP] Add `#pragma omp flatten` loop directive + `depth` clause (PR #206977)

[Michael Kruse via llvm-commits]

================
@@ -0,0 +1,41 @@
+// RUN: %libomp-compile -fopenmp-version=61 && %libomp-run | FileCheck %s
+// --match-full-lines
----------------
Meinersbur wrote:

```suggestion
// RUN: %libomp-compile -fopenmp-version=61 && %libomp-run | FileCheck %s \
// RUN: --match-full-lines
```
Did clang-format do this? Consider the line break here:
```suggestion
// RUN: %libomp-compile -fopenmp-version=61 && %libomp-run \
// RUN:   | FileCheck %s --match-full-lines
```

https://github.com/llvm/llvm-project/pull/206977