Todd Gamblin e3939b0c72 performance: don't recompute hashes when regenerating environments ... `ViewDescriptor.regenerate()` was copying specs and stripping build dependencies, which clears `_hash` and other cached fields on concrete specs, which causes a bunch of YAML hashes to be recomputed. - [x] Preserve the `_hash` and `_normal` fields on stripped specs, as these will be unchanged.		2019-12-23 23:18:46 -08:00
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spack	performance: don't recompute hashes when regenerating environments	2019-12-23 23:18:46 -08:00