Add liquid-containers and liquid-ghc-prim to icfp benchmark
Add liquid-containers and liquid-ghc-prim to icfp benchmark

ucsd-progsys/liquidhaskell,ucsd-progsys/liquidhaskell,ucsd-progsys/liquidhaskell,ucsd-progsys/liquidhaskell,ucsd-progsys/liquidhaskell,ucsd-progsys/liquidhaskell