carry over changes from LJForceComputeGPU.cc.
carry over changes from LJForceComputeGPU.cc.


git-svn-id: d33ecf05ab5aa9af4fe81233c65dba2e09466120@1819 fa922fa7-2fde-0310-acd8-f43f465a7996

joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue