[llvm] [openmp] [OpenMP][OMPX] Add shfl_down_sync (PR #93311)

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``````````bash
git-clang-format --diff 53b904823cba4e93d58793b0804407f812477724 267ea749058e95b4b5db137f7010641321d5465b -- offload/test/offloading/ompx_bare_shfl_down_sync.cpp offload/DeviceRTL/include/Utils.h offload/DeviceRTL/src/Mapping.cpp offload/DeviceRTL/src/Utils.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/offload/test/offloading/ompx_bare_shfl_down_sync.cpp b/offload/test/offloading/ompx_bare_shfl_down_sync.cpp
index fecc214176..ac6ce25cc6 100644
--- a/offload/test/offloading/ompx_bare_shfl_down_sync.cpp
+++ b/offload/test/offloading/ompx_bare_shfl_down_sync.cpp
@@ -41,7 +41,8 @@ template <typename T> void test() {
   for (int i = 0; i < N; ++i)
     data[i] = i;
 
-#pragma omp target teams ompx_bare num_teams(num_blocks) thread_limit(block_size) map(tofrom : data[0 : N])
+#pragma omp target teams ompx_bare num_teams(num_blocks)                       \
+    thread_limit(block_size) map(tofrom : data[0 : N])
   {
     int tid = ompx_thread_id_x();
     data[tid] = ompx::shfl_down_sync(~0U, data[tid], 1);

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https://github.com/llvm/llvm-project/pull/93311