Added a package for Nvida NCCL (#3552)
Added a package for Nvida NCCL (#3552)


LLNL/spack,skosukhin/spack,tmerrick1/spack,tmerrick1/spack,tmerrick1/spack,matthiasdiener/spack,TheTimmy/spack,matthiasdiener/spack,skosukhin/spack,krafczyk/spack,tmerrick1/spack,mfherbst/spack,EmreAtes/spack,skosukhin/spack,krafczyk/spack,EmreAtes/spack,lgarren/spack,EmreAtes/spack,EmreAtes/spack,mfherbst/spack,TheTimmy/spack,mfherbst/spack,mfherbst/spack,LLNL/spack,skosukhin/spack,LLNL/spack,EmreAtes/spack,iulian787/spack,skosukhin/spack,LLNL/spack,lgarren/spack,matthiasdiener/spack,iulian787/spack,krafczyk/spack,matthiasdiener/spack,mfherbst/spack,TheTimmy/spack,iulian787/spack,lgarren/spack,lgarren/spack,iulian787/spack,lgarren/spack,iulian787/spack,LLNL/spack,tmerrick1/spack,krafczyk/spack,matthiasdiener/spack,TheTimmy/spack,TheTimmy/spack,krafczyk/spack