devirtualize memory manager's destructor. Delete assignments
devirtualize memory manager's destructor. Delete assignments

9prady9/arrayfire,9prady9/arrayfire,9prady9/arrayfire,umar456/arrayfire,umar456/arrayfire,arrayfire/arrayfire,umar456/arrayfire,arrayfire/arrayfire,umar456/arrayfire,9prady9/arrayfire,arrayfire/arrayfire,arrayfire/arrayfire