Todd Gamblin aff0e8b592 architecture: make it easier to get a Spec for the default arch ... - [x] Make it easier to get a `Spec` with a proper `ArchSpec` from an `Arch` object via new `Arch.to_spec()` method. - [x] Pull `spack.architecture.default_arch()` out of `spack.architecture.sys_type()` so we can get an `Arch` instead of a string.		2020-08-12 23:58:10 -07:00
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spack	architecture: make it easier to get a Spec for the default arch	2020-08-12 23:58:10 -07:00