made arch instantiate as a tuple
made arch instantiate as a tuple

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