Make one-shot a per-registration property

Hi, This is just confirmation. Ben's one-shot patch (*1) is included in master but not included in the ghc-7.10 branch. Is this intentional? Is it supposed to be merged in GHC 7.12? (*1) 023439980f6ef6ec051f676279ed2be5f031efe6 https://phabricator.haskell.org/D347 --Kazu