[clang] [llvm] [mlir] [OpenMP] Migrate GPU Reductions CodeGen from Clang to OMPIRBuilder (PR #80343)

[Johannes Doerfert via cfe-commits]

================
@@ -99,14 +100,20 @@ class OpenMPIRBuilderConfig {
   /// expanded.
   std::optional<bool> IsGPU;
 
-  // Flag for specifying if offloading is mandatory.
+  /// Flag for specifying if LLVMUsed information should be emitted.
+  std::optional<bool> EmitLLVMUsed;
----------------
jdoerfert wrote:

This is a generic sounding flag that guards a very very specific thing.
Is there ever a use case where the flag is not set (and it is checked)?

https://github.com/llvm/llvm-project/pull/80343