Todd Gamblin 9b90d7e801 performance: reduce system calls required for remove_dead_links ... `os.path.exists()` will report False if the target of a symlink doesn't exist, so we can avoid a costly call to realpath here.		2019-12-23 18:36:56 -08:00
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spack	performance: reduce system calls required for remove_dead_links	2019-12-23 18:36:56 -08:00