[mlir] Use std::optional instead of llvm::Optional (NFC)

diff --git a/mlir/include/mlir/Debug/ExecutionContext.h b/mlir/include/mlir/Debug/ExecutionContext.h
index 43a838f..097ae37 100644 (file)
--- a/mlir/include/mlir/Debug/ExecutionContext.h
+++ b/mlir/include/mlir/Debug/ExecutionContext.h
@@ -117,7 +117,7 @@ private:
   /// Next point to stop execution as describe by `Control` enum.
   /// This is handle by indicating at which levels of depth the next
   /// break should happen.
-  Optional<int> depthToBreak;
+  std::optional<int> depthToBreak;
 
   /// Observers that are notified before and after the callback is executed.
   SmallVector<Observer *> observers;