add neon sum_u8/u16/u64
add neon sum_u8/u16/u64

jakirkham/numpy,anntzer/numpy,endolith/numpy,anntzer/numpy,mattip/numpy,pdebuyl/numpy,rgommers/numpy,anntzer/numpy,endolith/numpy,simongibbons/numpy,madphysicist/numpy,mattip/numpy,pdebuyl/numpy,charris/numpy,mattip/numpy,mhvk/numpy,seberg/numpy,simongibbons/numpy,anntzer/numpy,charris/numpy,numpy/numpy,mhvk/numpy,endolith/numpy,madphysicist/numpy,endolith/numpy,rgommers/numpy,charris/numpy,seberg/numpy,pbrod/numpy,rgommers/numpy,pbrod/numpy,pdebuyl/numpy,charris/numpy,jakirkham/numpy,mattip/numpy,numpy/numpy,mhvk/numpy,simongibbons/numpy,pbrod/numpy,pbrod/numpy,numpy/numpy,pbrod/numpy,seberg/numpy,jakirkham/numpy,numpy/numpy,madphysicist/numpy,mhvk/numpy,jakirkham/numpy,simongibbons/numpy,madphysicist/numpy,jakirkham/numpy,mhvk/numpy,seberg/numpy,simongibbons/numpy,pdebuyl/numpy,rgommers/numpy,madphysicist/numpy