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Previously `git gc` was being run on every gitdir even when they shared the same objects. Instead only call it once and use pack-refs for the gitdirs that were not gc'ed. Bug: https://crbug.com/gerrit/15113 Test: repo sync -j # and check that git pack-refs is called Change-Id: Icff37ab3ec78cfb44391d8cc7f2d875991532320 Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/320275 Tested-by: Allen Webb <allenwebb@google.com> Reviewed-by: Mike Frysinger <vapier@google.com>