Add Communication Hiding to GPU version

src/gpu/VirtualFluids_GPU/DataStructureInitializer/GridReaderGenerator/IndexRearrangementForStreams.h

@@ -23,10 +23,6 @@ class Communicator;
 
 class IndexRearrangementForStreams
 {
-private:
-    std::shared_ptr<GridBuilder> builder;
-    std::shared_ptr<Parameter> para;
-    vf::gpu::Communicator& communicator;
 public:
     //! \brief construct IndexRearrangementForStreams object
     IndexRearrangementForStreams(std::shared_ptr<Parameter> para, std::shared_ptr<GridBuilder> builder, vf::gpu::Communicator& communicator);
@@ -156,6 +152,11 @@ private:
     void getGridInterfaceIndicesBorderBulkFC(int level);
 
 
+private:
+    std::shared_ptr<GridBuilder> builder;
+    std::shared_ptr<Parameter> para;
+    vf::gpu::Communicator& communicator;
+
     // used for tests
     friend class IndexRearrangementForStreamsTest_reorderSendIndices;
 };