[mlir][bufferize] Fix broken implementation of denyDialect (#85881)

The current implementation is not functional and does not compile. The
patch allows to correctly mark a dialect as denied for the purpose of
bufferization.

Author: mfrancio

mlir/include/mlir/Dialect/Bufferization/IR/BufferizableOpInterface.h

@@ -147,6 +147,16 @@ class OpFilter {
     entries.push_back(Entry{filterFn, Entry::FilterType::ALLOW});
   }
 
+  /// Deny the given dialect.
+  ///
+  /// This function adds a DENY entry.
+  void denyDialect(StringRef dialectNamespace) {
+    Entry::FilterFn filterFn = [=](Operation *op) {
+      return op->getDialect()->getNamespace() == dialectNamespace;
+    };
+    entries.push_back(Entry{filterFn, Entry::FilterType::DENY});
+  }
+
   /// Allow the given ops.
   ///
   /// This function adds one or multiple ALLOW entries.