Merge branch 'jk/check-connected-with-alternates'

The tips of refs from the alternate object store can be used as
starting point for reachability computation now.

* jk/check-connected-with-alternates:
check_everything_connected: assume alternate ref tips are valid
object-store.h: move for_each_alternate_ref() from transport.h

diff --cc Documentation/rev-list-options.txt
Simple merge

diff --cc builtin/receive-pack.c
Simple merge

diff --cc object-store.h
Simple merge

diff --cc revision.c
Simple merge

diff --cc sha1-file.c
Simple merge