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

[Amit Tiwari via llvm-commits]

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+// RUN: c-index-test -test-load-source local %s -fopenmp=libomp -fopenmp-version=60 | FileCheck %s
+
+void test(void) {
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loopacino wrote:

It runs 0 times.

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