The following instances are added

    instance Bounded a => Bounded (Const a b)
    instance Enum a => Enum (Const a b)
    instance Ix a => Ix (Const a b)
    instance Storable a => Storable (Const a b)

    instance Bounded a => Bounded (Identity a)
    instance Enum a => Enum (Identity a)
    instance Ix a => Ix (Identity a)
    instance Semigroup a => Semigroup (Identity a)
    instance Storable a => Storable (Identity a)

Reviewers: ekmett, RyanGlScott, rwbarton, hvr, austin, bgamari

Reviewed By: RyanGlScott, hvr

Subscribers: rwbarton, RyanGlScott, thomie

Differential Revision: https://phabricator.haskell.org/D1626

GHC Trac Issues: #11210