use nvbio's parallel prims
use nvbio's parallel prims

[git-p4: depot-paths = "//sw/gpgpu/nvbio/internal/": change = 18518862]

NVlabs/nvbio,NVlabs/nvbio,kimrutherford/nvbio,NVlabs/nvbio,kimrutherford/nvbio,kimrutherford/nvbio,kimrutherford/nvbio,NVlabs/nvbio