Make unittests work in component build

src/compiler/int64-lowering.h

 // Copyright 2014 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_INT64_LOWERING_H_
 #define V8_COMPILER_INT64_LOWERING_H_
 
 #include "src/compiler/common-operator.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/machine-operator.h"
 #include "src/compiler/node-marker.h"
+#include "src/globals.h"
 #include "src/zone/zone-containers.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
-class Int64Lowering {
+class V8_EXPORT_PRIVATE Int64Lowering {
  public:
   Int64Lowering(Graph* graph, MachineOperatorBuilder* machine,
                 CommonOperatorBuilder* common, Zone* zone,
                 Signature<MachineRepresentation>* signature);
 
   void LowerGraph();
 
   static int GetParameterCountAfterLowering(
       Signature<MachineRepresentation>* signature);
 
@@ skipping 44 matching lines @@
   Replacement* replacements_;
   Signature<MachineRepresentation>* signature_;
   Node* placeholder_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INT64_LOWERING_H_