RFR: Make update-refs cancellable

Roman Kennke rkennke at redhat.com
Wed Mar 29 15:02:55 UTC 2017

This makes update-refs respect cancellation due to OOM, and
short-circuit it to arrive at full-gc faster.

It does *not* implement short-circuiting for the case where heuristics
would want to start a new GC cycle. This is significantly more difficult.



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