Todd Gamblin 5cb40cbcd2 directory_layout: remove outdated checks for old DAG hash ... We previously had checks in `directory_layout` to check for build-dependency conflicts when we weren't storing build dependencies. We don't need those anymore; we can just rely on the DAG hash now that it includes everything we know about each spec. - [x] Remove vestigial code for checking installed spec against concrete spec in `ensure_installed()` - [x] Remove `SpecHashCollisionError` -- if specs have the same hash now, they're the same as far as `DirectoryLayout` should be concerned. - [x] Convert spec comparison to `dag_hash()` comparison when adding extensions.		2022-05-13 10:45:12 -07:00
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spack	directory_layout: remove outdated checks for old DAG hash	2022-05-13 10:45:12 -07:00