[IR Dialect] ⚔Elden chapter 1.1⚔ (#55525)

* IntArrayAttributeStorage

paddle/fluid/ir/dialect/pd_attribute.cc

@@ -16,7 +16,9 @@
 
 namespace paddle {
 namespace dialect {
-phi::IntArray IntArrayAttribute::data() const { return storage()->GetAsKey(); }
+const phi::IntArray& IntArrayAttribute::data() const {
+  return storage()->GetAsKey();
+}
 
 phi::DataType DataTypeAttribute::data() const { return storage()->GetAsKey(); }
 

paddle/fluid/ir/dialect/pd_attribute.h

@@ -33,7 +33,7 @@ class IntArrayAttribute : public ir::Attribute {
     return storage() < right.storage();
   }
 
-  phi::IntArray data() const;
+  const phi::IntArray &data() const;
 };
 
 class ScalarAttribute : public ir::Attribute {

paddle/fluid/ir/dialect/pd_attribute_storage.h

@@ -48,7 +48,7 @@ struct IntArrayAttributeStorage : public ir::AttributeStorage {
            (data_.FromTensor() == key.FromTensor());
   }
 
-  ParamKey GetAsKey() const { return ParamKey(data_); }
+  const ParamKey &GetAsKey() const { return data_; }
 
  private:
   phi::IntArray data_;