lsa: Avoid the call to segment_pool::descriptor() in compact()
lsa: Avoid the call to segment_pool::descriptor() in compact()

scylladb/scylla,scylladb/scylla,duarten/scylla,duarten/scylla,avikivity/scylla,duarten/scylla,avikivity/scylla,scylladb/scylla,scylladb/scylla,avikivity/scylla