Revert "[mlir] Fix -Wunused-variable in OpenMPToLLVMIRTranslation.cpp…

… (NFC)"

This reverts commit 46ec271.

mlir/lib/Target/LLVMIR/Dialect/OpenMP/OpenMPToLLVMIRTranslation.cpp

@@ -3923,7 +3923,7 @@ convertOmpTarget(Operation &opInst, llvm::IRBuilderBase &builder,
       // So, we don't store it in any datastructure. Instead, we just
       // do some sanity checks on it right now.
       auto mapInfoOp = mappedValue.getDefiningOp<omp::MapInfoOp>();
-      [[maybe_unused]] Type varType = mapInfoOp.getVarType();
+      Type varType = mapInfoOp.getVarType();
 
       // Check #1: Check that the type of the private variable matches
       // the type of the variable being mapped.