hpgmp package: Don't add cpu=native on ARM when using gcc 5.x or before (#12034)
hpgmp package: Don't add cpu=native on ARM when using gcc 5.x or before (#12034)


LLNL/spack,iulian787/spack,iulian787/spack,iulian787/spack,LLNL/spack,iulian787/spack,LLNL/spack,iulian787/spack,LLNL/spack,LLNL/spack