Yuya Nishihara d1701a5d95 git: on import_refs(), avoid loading git commit object if it's known
With my colocated "linux" repo, this appears to save ~50ms startup overhead.
Since the repo has lots of indirect tags, we can't eliminate tag object
loading at all. But still, it's faster than falling back to peel_to_commit().
2023-06-23 16:26:13 +09:00
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