[clang] [llvm] [mlir] [MLIR][OpenMP] Add codegen for teams reductions (PR #133310)

[Sergio Afonso via llvm-commits]

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@@ -4161,6 +4247,37 @@ convertOmpDistribute(Operation &opInst, llvm::IRBuilderBase &builder,
   if (failed(checkImplementationStatus(opInst)))
     return failure();
 
+  /// Process teams op reduction in distribute if the reduction is contained in
+  /// the distribute op.
+  omp::TeamsOp teamsOp = opInst.getParentOfType<omp::TeamsOp>();
+  bool doDistributeReduction =
+      teamsOp ? teamsReductionContainedInDistribute(teamsOp) : false;
+
+  DenseMap<Value, llvm::Value *> reductionVariableMap;
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skatrak wrote:

Nit: This looks like it could be moved into the `if`.

It actually looks like it would make sense to make it local to `allocAndInitializeReductionVars`, since I can't see anywhere it being used outside of it, but that can be looked into later on.

https://github.com/llvm/llvm-project/pull/133310