feat: toy tutorial chapter 3.

Signed-off-by: jackfiled <xcrenchangjun@outlook.com>

lib/HelloCombine.cpp

@@ -0,0 +1,41 @@
+//
+// Created by ricardo on 02/06/25.
+//
+
+#include <mlir/IR/PatternMatch.h>
+#include "Dialect.h"
+#include "HelloCombine.inc"
+
+
+struct SimplifyRedundantTranspose final : mlir::OpRewritePattern<mlir::hello::TransposeOp>
+{
+    explicit SimplifyRedundantTranspose(mlir::MLIRContext* context) : OpRewritePattern(
+        context)
+    {
+    }
+
+    /// Transpose(Transpose(x)) = x
+    mlir::LogicalResult matchAndRewrite(mlir::hello::TransposeOp op, mlir::PatternRewriter& rewriter) const override
+    {
+        mlir::Value transposeInput = op.getOperand();
+        auto transposeInputOp = transposeInput.getDefiningOp<mlir::hello::TransposeOp>();
+
+        if (!transposeInputOp)
+        {
+            return mlir::failure();
+        }
+
+        rewriter.replaceOp(op, {transposeInputOp.getOperand()});
+        return mlir::success();
+    }
+};
+
+void mlir::hello::TransposeOp::getCanonicalizationPatterns(RewritePatternSet& set, MLIRContext* context)
+{
+    set.add<SimplifyRedundantTranspose>(context);
+}
+
+void mlir::hello::ReshapeOp::getCanonicalizationPatterns(RewritePatternSet& set, MLIRContext* context)
+{
+    set.add<ReshapeReshapeOptPattern, RedundantShapeOptPattern, FoldConstantReshapeOptPattern>(context);
+}