Restored SharedPointer::swap for host.

src/TNL/Pointers/SharedPointerHost.h

@@ -208,6 +208,11 @@ class SharedPointer<  Object, Devices::Host > : public SmartPointer
          this->free();
       }
 
+      void swap( ThisType& ptr2 )
+      {
+         std::swap( this->pd, ptr2.pd );
+      }
+      
       ~SharedPointer()
       {
          this->free();