add concatMapM to base in control.monad

[David Feuer]

I really don't see why we need this.

On Fri, Feb 8, 2019, 12:04 PM Carter Schonwald <carter.schonwald at gmail.com
wrote:

> friend asked me to raise this
>
> previously https://ghc.haskell.org/trac/ghc/ticket/2042
> seems like it iddn't happen last time because base lived outside of ghc?
>
> -- | The 'concatMapM' function generalizes 'concatMap' to arbitrary monads.
> concatMapM        :: (Monad m) => (a -> m [b]) -> [a] -> m [b]
> concatMapM f xs   =  liftM concat (mapM f xs)
>
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