[llvm] [openmp] [OpenMP][OMPX] Add ballot_sync (PR #91297)

[Johannes Doerfert via llvm-commits]

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@@ -57,6 +59,12 @@ int32_t shuffleDown(uint64_t Mask, int32_t Var, uint32_t LaneDelta,
   return __builtin_amdgcn_ds_bpermute(Index << 2, Var);
 }
 
+uint32_t ballotSync(uint32_t Mask, int32_t Pred) {
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jdoerfert wrote:

64 bit seems reasonable, I think.

https://github.com/llvm/llvm-project/pull/91297