Make unittests work in component build

src/compiler/int64-lowering.h

Index: src/compiler/int64-lowering.h
diff --git a/src/compiler/int64-lowering.h b/src/compiler/int64-lowering.h
index 084c07a87ccaa705558f3f38007d2062a4d3647c..66a54e9c3f9be2b2d595a4d69c0c562d197f0f0a 100644
--- a/src/compiler/int64-lowering.h
+++ b/src/compiler/int64-lowering.h
@@ -9,13 +9,14 @@
 #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,