NFC: Add a missing include for std::isalnum and std::digit.

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PiperOrigin-RevId: 250085298

diff --git a/mlir/lib/TableGen/Format.cpp b/mlir/lib/TableGen/Format.cpp
index 6dd260a..967d51a 100644 (file)
--- a/mlir/lib/TableGen/Format.cpp
+++ b/mlir/lib/TableGen/Format.cpp
@@ -22,6 +22,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "mlir/TableGen/Format.h"
+#include <cctype>
 
 using namespace mlir;
 using namespace mlir::tblgen;