[Shootout-list] ghc accerman (same speed, smaller loc) and procinst update

[Einar Karttunen]

Hello

Updated the ackerman version of ghc to be more concise, does not
affect performance. 

Added a Haskell version for procinst. This seems quite fast and clean. 
Please feel free to nuke/modify it if the test changes.

- Einar Karttunen