[BugFix] Replace include dense_tensor.h with forward declare in phi lib (#55396)

* copy dense_tensor.h to inference lib

* update

* update

paddle/fluid/framework/ir/constant_folding_pass.cc

@@ -157,7 +157,7 @@ void ConstantFoldingPass::ApplyImpl(ir::Graph *graph) const {
     }
     delete local_scope;
   }
-  LOG(INFO) << folded_op_num << " Ops are folded";
+  AddStatis(folded_op_num);
 }
 
 }  // namespace ir

paddle/fluid/inference/api/demo_ci/utils.h

@@ -21,6 +21,7 @@
 #include <string>
 #include <vector>
 
+#include "paddle/extension.h"      // For pr test!
 #include "paddle_inference_api.h"  // NOLINT
 
 namespace paddle {
@@ -83,6 +84,8 @@ void CheckOutput(const std::string& referfile,
   auto refer = ProcessALine(line);
   file.close();
 
+  paddle::Tensor dummy;
+
   size_t numel = output.data.length() / PaddleDtypeSize(output.dtype);
   VLOG(3) << "predictor output numel " << numel;
   VLOG(3) << "reference output numel " << refer.data.size();

paddle/phi/common/tensor_ref.h

@@ -14,6 +14,7 @@
 
 #pragma once
 
+#include <cassert>
 #include <cstdint>
 #include <limits>
 #include <sstream>
@@ -21,11 +22,11 @@
 
 #include "paddle/phi/api/ext/exception.h"
 #include "paddle/phi/common/data_type.h"
-#include "paddle/phi/core/dense_tensor.h"
-#include "paddle/phi/core/enforce.h"
 
 namespace phi {
 
+class DenseTensor;
+
 // In static model pre analysis, we can't get the data from tensor
 class TensorRef {
  public:
@@ -34,8 +35,7 @@ class TensorRef {
   explicit TensorRef(const DenseTensor* base) : tensor_base_(base) {}
 
   const DenseTensor* Get() const {
-    PADDLE_ENFORCE_NOT_NULL(tensor_base_,
-                            "Can not get null ptr from Tensor ref scalar");
+    assert(tensor_base_ != nullptr);
     return tensor_base_;
   }