fix missing stringhelper include in testpoolingofrard
fix missing stringhelper include in testpoolingofrard

Peilong/DeepCL,Peilong/DeepCL,mrgloom/DeepCL,pimms/DeepCL,hughperkins/DeepCL,FighterLYL/DeepCL,MiniLight/DeepCL,MiniLight/DeepCL,MiniLight/DeepCL,MiniLight/DeepCL,mrgloom/DeepCL,pimms/DeepCL,hughperkins/DeepCL,FighterLYL/DeepCL,hughperkins/DeepCL,FighterLYL/DeepCL,hughperkins/DeepCL,pimms/DeepCL,pimms/DeepCL,hughperkins/DeepCL,Peilong/DeepCL,FighterLYL/DeepCL,Peilong/DeepCL,FighterLYL/DeepCL,pimms/DeepCL,mrgloom/DeepCL,Peilong/DeepCL,mrgloom/DeepCL,MiniLight/DeepCL,mrgloom/DeepCL