Make unittests work in component build

src/compiler/tail-call-optimization.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_TAIL_CALL_OPTIMIZATION_H_
 #define V8_COMPILER_TAIL_CALL_OPTIMIZATION_H_
 
 #include "src/compiler/graph-reducer.h"
+#include "src/globals.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 // Forward declarations.
 class CommonOperatorBuilder;
 class Graph;
 
 
 // Performs tail call optimization by replacing certain combinations of Return
 // and Call nodes with a single TailCall.
-class TailCallOptimization final : public Reducer {
+class V8_EXPORT_PRIVATE TailCallOptimization final : public Reducer {
  public:
   TailCallOptimization(CommonOperatorBuilder* common, Graph* graph)
       : common_(common), graph_(graph) {}
 
   Reduction Reduce(Node* node) final;
 
  private:
   CommonOperatorBuilder* common() const { return common_; }
   Graph* graph() const { return graph_; }
 
   CommonOperatorBuilder* const common_;
   Graph* const graph_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_TAIL_CALL_OPTIMIZATION_H_