[llvm] [mlir] eliminating g++ warnings (PR #105520)

[Jakub Kuderski via llvm-commits]

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@@ -1629,7 +1629,7 @@ verifyTrait(Operation *) {
 
 /// Given a set of traits, return the result of verifying the given operation.
 template <typename... Ts>
-LogicalResult verifyTraits(Operation *op) {
+LogicalResult verifyTraits([[maybe_unused]] Operation *op) {
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kuhar wrote:

Do we need this one?

https://github.com/llvm/llvm-project/pull/105520