[Haskell-cafe] Support of multi-constructor types by UNPACK pragma

[Nikita Volkov]

FWIW, I posted a ticket:
https://ghc.haskell.org/trac/ghc/ticket/9214

Together with the following issues it would make a lot of data structures
lighter in terms of memory footprint:
https://ghc.haskell.org/trac/ghc/ticket/7647
https://ghc.haskell.org/trac/ghc/ticket/3990
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