[IR] polish the concrete op api (#54928)

paddle/fluid/ir/dialect/op_gen.py

@@ -78,9 +78,9 @@ op_n_attribute_declare_str = (
     "static const char *attributes_name[{attribute_num}];"
 )
 
-OP_GET_INPUT_TEMPLATE = """  ir::OpOperand {input_name}() {{ return operation()->op_operand({input_index}); }}
+OP_GET_INPUT_TEMPLATE = """  ir::Value {input_name}() {{ return operand({input_index}); }}
 """
-OP_GET_OUTPUT_TEMPLATE = """  ir::OpResult {output_name}() {{ return operation()->result({output_index}); }}
+OP_GET_OUTPUT_TEMPLATE = """  ir::OpResult {output_name}() {{ return result({output_index}); }}
 """
 
 # =====================================

paddle/ir/core/op_base.h

@@ -84,6 +84,10 @@ class IR_API OpBase {
 
   const AttributeMap &attributes() const { return operation_->attributes(); }
 
+  Value operand(uint32_t index) const { return operation_->operand(index); }
+
+  OpResult result(uint32_t index) const { return operation_->result(index); }
+
  private:
   Operation *operation_;  // Not owned
 };